Search activities with children of the general developmental group from 4-5 years old Topic: “Why does a mosquito squeak and a bumblebee buzz?”

Humming tone

Every person, at least once in his life, has noticed that flies buzz in different ways. One is louder, the other is quieter. Biologists have conducted research and found that the tone of the buzzing is influenced by:

1. Body size.
2. Wing flapping frequency.
3. The room in which the pest is located.

A large insect has larger wings. Therefore, they capture a larger area of ​​air and a person hears the buzzing more clearly. For example, small midges cannot be heard because they are too small. A similar fact applies to all winged insects, with the exception of the butterfly. It is impossible to hear her waves.

The frequency of the wing flapping also plays an important role in tone. The faster the insect works with its halteres, the more the air vibrates.

A person most often pays attention to an annoying buzzing sound in an apartment or other room. If there are few things in the room, the sound made by the wings will be louder. The vibrating air diverges evenly, without fading when colliding with other objects.

Important: any fly can buzz while sitting on a window or other surface, that is, it does not have to fly.

This is due to the fact that she does not see the obstacle and is trying to take off. The same applies if the insect is injured.

Lifehacks

For proper operation of the refrigerator, you need to follow the operating rules, and also know some tricks that will help in the prevention of this device.

It is important to know the misconceptions that are spread by various specialists: from private masters to service centers

Common misconceptions and useless advice

Let's look at the most common and ridiculous recommendations that you can hear:

1. The new equipment should make a little noise (hum). In this case, the “norm” is a humming refrigerator that operates this way for more than a day. In fact, it should make noise when first turned on, but not for more than 2-3 hours. During this time, the temperature inside the chambers will “settle down” and the compressor will begin to operate more quietly.
2. Some experts attribute the hum to a lack of freon in the system, without making any diagnostics. At the same time, they are not guided by anything, relying only on their experience. As written above, there are many reasons for the occurrence of hum. Only a thorough diagnosis can reveal the true malfunction.
3. Equipment with two compressors is quieter than with one. Allegedly, the load is distributed and the compressors individually need less power, and accordingly, they make less noise. This is a myth invented by marketers to increase prices for such models. Single-compressor models operate with the same noise level. The only difference is ease of use.
4. If the hum is due to a clogged refrigerant pipe, then you can only throw out the refrigerator. Only inexperienced masters say this. It's better not to deal with them.

Now let's look at useful tips that really help cope with noise.

How to reduce noise

To reduce noise levels, follow these guidelines:

1. Install the refrigerator level
2. Do not lean it against the wall or place it close to furniture or other interior items.
3. Remove the shipping bolts after purchase and unpacking.
4. Carry out diagnostics at the first sign of a problem. (appearance of icing, unclear operation of the compressor).

Lifespan of a fly

Common fly Theoretically, an insect at the adult stage lives no more than 2 weeks. The lifespan of a fly is shortened due to the presence of natural enemies. How long flies live in an apartment depends on human activity.

If the insects are not disturbed, they are in no hurry to die and will happily live a happy life for 2 months. In the wild, some members of the family live only 14 days. With the use of all kinds of traps, the life of insects is quickly reduced. Pests instantly begin to die from the poison, which humans often use in the form of an aerosol, spray, or solution.

The lifespan of flies may increase if wintering is ahead. Whether insects die or fall asleep depends on the resourcefulness of the imago. Their task is to find a safe place for wintering. Where flies hibernate: in cracks in walls, window openings, basements, any secluded places with a cool temperature. Otherwise, the insect dies under exposure to cold. Egg laying stops in winter.

At the end of September, flies become slow and fly little. They are easy to slam with your palms, which was impossible to do before. Life processes slow down. In a secluded place, the insect stops moving, which allows it to successfully overwinter.

We suggest you read: Medvedka photo and description of how to fight

Larval development

The development rate of the young generation of mosquitoes depends on the water temperature. The optimal indicator is 15-20 degrees Celsius. The duration of development of larvae in the egg is from 40 hours to 8 days. They are born no larger than 2 mm in size. The body of the larva consists of a head, thorax, and abdomen. The future mosquito feeds on microorganisms in the water.

During the entire period of development, the larvae molt 4 times, constantly increasing in size. The cycle from egg formation to adult emergence lasts about 60 days. At the last stage of development, the larva turns into a pupa, shaped like a comma.

In the pupal stage, the mosquito develops from 2 to 5 days. During this time, serious changes take place inside. The pupa is extremely active, can go deep into the water, but periodically emerges to replenish oxygen reserves.

Upon completion of development, the mosquito breaks through the upper part, sticks out its head, then its chest. The last to be shown are the limbs. The body size of a regular mosquito is 4 mm. The insect is immediately ready for fertilization, so it begins an active search for a sexual partner.

What features does a fly have?

Buzzing is not the only characteristic of flies. They are very active, and their reaction is 10 times higher than that of a human. This is why it is quite difficult to catch an insect.

As for the body features, the fly has a very mobile head. This directly affects her reaction. On the head there are eyes with a complex structure. Each eye has about 3,000 small eyes.

Fertility is also worth noting. The female is capable of laying 600 eggs at a time. Scientists conducted a study and proved that a fly is capable of laying up to 2 billion eggs over the summer. This doesn't happen in real life. This is due to the fact that flies often die. There are many reasons why pests die. Most often they are:

• get caught in a web;
• become dinner for birds;
• die at the hands of man.

Important: flies are not only capable of annoying with their buzzing, but can also cause a lot of trouble to a person.

To prevent insects from annoying you with their buzzing, you need to get rid of them in a timely manner.

AMI BIOS

Why do mosquitoes squeak?

Who loves mosquitoes? How can you even love these vile buzzing insects that are ready at the first convenient opportunity to bite into you and suck your blood, leaving mercilessly itchy wounds? And yet, despite all your dislike for mosquitoes, you were probably curious to know more about them. Think about it, what do you even know about mosquitoes? A couple of myths? Your own negative experience? How to choose a mosquito repellent

? Why do mosquitoes bite people? Why do they make a nasty squeak? Why do they even exist, why did nature conceive these little villains? You need to know the enemy by sight! Let's learn more about mosquitoes.

Mosquitoes: who bites females or males

The proboscis of males is more delicate. Due to the lack of piercing bristles, they cannot pierce the skin. What do male mosquitoes eat? Like many other insects, they feed on plant matter. Mainly carbohydrates: pollen and flower nectar. If a person hears a characteristic mosquito squeak, this does not mean that an insect capable of biting is nearby.

If the female, for various reasons, cannot find blood, she temporarily becomes a vegetarian. In this case, egg laying is impossible or significantly reduced. Protein and carbohydrate foods are processed in different parts of the digestive tract. If the female is “drinked” with a drop of blood, she will die. Protein food will end up in the wrong place. The section required for this purpose opens only when the skin is pierced.

It is believed that mosquitoes are selective when choosing a victim. If possible, they prefer the host's blood with a high content of cholesterol and testosterone. Some species of mosquitoes are particularly selective and look for victims among cold-blooded frogs, caterpillars and even fish.

Symptoms and therapy

The mark of a fly bite and the accompanying symptoms depend on the type of insect, the state of health and the individual characteristics of the person. And the presence and intensity of symptoms, in turn, determine the treatment regimen. Most often the bite is accompanied by:

• severe pain (there are no anesthetic components in the fly’s saliva);
• swelling;
• redness, in the center of which there is a noticeable dot with a dried drop of blood.

Bite

In children and people with sensitive skin, the signs are more pronounced.

Why does swelling occur?

If a person is bitten by a fly, swelling almost always appears. This is explained by the fact that a toxic substance enters the bloodstream with the insect’s saliva, which is carried throughout the body. As a result, microcirculation is disrupted in the affected area, the permeability of the vascular walls increases, and edema forms.

First aid

If a person is bitten by a fly, the first thing to do is wash the wound with clean water (or with soap). Next, the affected area can be treated with an antiseptic; ice or a cold compress is applied to relieve pain and reduce swelling. To prevent the development of allergies after a fly bite, take an antihistamine.

Consequences and complications

Basically, the consequences that occur after a fly bite are associated with the development of an allergic reaction. The person bitten may experience:

• itching;
• weakness;
• dizziness;
• nausea;
• difficulty breathing.

In severe cases, the victim may develop Quincke's edema or anaphylactic shock.

Screaming child

Behind this sound there is not just air vibration, but a whole evolutionary mechanism. The baby's cries and cries are created in such a way that they cannot be ignored. So, if something happens to the boy, he will definitely be able to attract the attention of adults. It’s just a pity that the rest of the minibus passengers have nothing to do with this attention.

The worst thing is when you are traveling with a screaming child in public transport. It’s really bad if the transport is an airplane. So last year, Japanese airlines began pre-listing the seats where children will sit so you can buy a ticket somewhere further away. And if you didn’t have time, then there is only one way out - get the loudest possible headphones with active noise cancellation.

Level of irritation: The higher the less opportunities you have to move to a safe distance.

Where does the sound come from?

Sound is a vibration or vibration. Let's take a glass for example. If he just stands there and doesn’t touch him, then he is silent, but if you just hit him lightly with a teaspoon - “ding”! Sound appears!

The secret of this phenomenon is simple: when struck, the glass of the glass is small and often trembles. The air around also begins to vibrate. reaches our ears, and we hear the “ding” - the sound made by the glass.

But the walls tremble completely unnoticed by our eyes. We can only hear this vibration in the form of sound. But if you touch the string, you can clearly see how the string vibrates and the sound is produced!

Reasons for the effectiveness of ultrasonic repellers

Insects emit a characteristic squeak to convey to others a signal of danger. Fertilized females use sound to repel males. Ultrasonic repellers imitate danger signals - the flight of a dragonfly, the signals of a bat, and also the warning of a fertilized female. Simple devices are extremely effective in the fight against bloodsuckers, which once again confirms their important role in creating the squeak of mosquitoes.

In parallel with this, the characteristic sounds of mosquitoes indicate the approach of insects to the victim - a person, and risk being killed. The same feature notifies natural enemies about the location of food.

Interesting facts about mosquito squeaks

Few creatures on the planet have the opportunity to boast of finding mention in the literature about radio engineering. Along with the bat, the mosquito is related to them. It is famous for its characteristic itching, which is used:

• For popular comparisons, examples in acoustics. It is present at the beginning and end of acoustic tables.
• To determine the hearing threshold. The sound power generated by the insect is distributed over a sphere with a radius of 2 meters. Squeak power per 1 sq. m of the surface of such a sphere - the area of ​​the input canal of the ear - is 250 watts. The mass of air driven is approximately 44 kg.
• For simulation in danger signaling devices at military installations.

Classification of flies: types and nutritional groups

The number of species of dipterous insects, which include flies, numbers several thousand. Some of them are synanthropic, i.e. they tend to live closer to people and consume waste, while others live in the wild (forests and fields) and are constantly searching for food. According to the organization of the feeding process, flies are divided into 3 groups:

• hematophagous (bazaar, zhigalka, tsetse, etc.) - blood-sucking, such flies in nature feed on blood, ichor and sweat, the diet of the larvae consists of excrement;
• nectarophages (wohlfart fly) - for adult individuals, plant juices serve as food, less often - animal droppings, the larvae develop and feed on organic tissues, since the female lays eggs on wounds and mucous membranes of animals and humans;
• coprophages (pasture, house) - they feed on food waste or excrement, in nature they can also consume plant juices;
• necrophages (meat), in which adult individuals feed on corpses, as well as food and meat waste, excrement;
• polyphages (indoor, etc.) - are omnivores, consuming food products and waste of plant and animal origin, as well as waste products of living organisms, discharge from wounds and mucous membranes as food.

When a person is not the owner of the house, but a tasty morsel

Flies are extremely annoying, but not because the purpose of their life is to drive a person to white heat. We can safely call them acrobat insects: they perform many tricks in the air, are able to spin in place and move backwards. This activity requires a lot of energy. It is not surprising that flies spend most of their lives searching for food.

Flies constantly land on humans because they feed on microelements from his sweat and sebum.

For them, human skin is like a self-assembled tablecloth; fat and exfoliated particles of the epidermis can be found on it. And human sweat is simply a storehouse of useful microelements for these insects! It contains various salts (calcium, phosphorus, potassium), sulfuric acid compounds, and products of protein metabolism. In a word, for them we are a walking pharmacy and a canteen rolled into one, and even free of charge.

In ancient times, the wingspan of flies reached one meter. Can you imagine such a giant chasing you from room to room? We can only be glad that we live here and now. Or is it too early to rejoice?

Different mosquito squeaks

Initially, it seems that all mosquitoes squeak the same way, but if you listen, the sounds are different. Males create a hum and are not particularly annoying to the human ear. Since they are not interested in blood, they are seen much less often than females.

Females communicate using squeaks. They transmit messages to each other about the location of a potential victim and warn of danger. Females attract males for mating with a thin squeak and flap their wings more often than usual. After fertilization, the individual sits quietly on the sidelines for several days, digesting food. And also during this time eggs are formed. Laying is done in a couple of days in a standing pond.

On a note!

Mosquitoes are attracted to a person by the smell of lactic acid, carbon dioxide, and infrared color, which forms an aura around the body. As soon as one female detects a victim, after a few minutes the person has to fight off a colony of annoying pests.

Causes of problems

All problems with the microphone are conditionally divided into 2 groups, namely: mechanical damage and system problems. Mechanical damage in most cases occurs unexpectedly. This may happen a few days after purchasing the device or several years later. System problems occur immediately after connecting the headset. Most often, problems with microphone operation are related to the device software. Many problems with wireless and wired microphones can be corrected yourself.

Conductor break

This problem is the most common in a headset that is constantly in use. The microphone signal becomes weak, it makes strange sounds instead of a voice, squeaks, buzzes, crackles, buzzes, wheezes, whistles or makes a lot of rustling noise. In some cases, a piercing squeak appears. Accordingly, due to such interference, the interlocutor cannot hear the voice of the owner of the faulty device. In 95% of cases, the problem is hidden in a break at the junctions of the conductors, namely in the connector area, at the audio line branching node. And in wireless microphones, a break occurs in the Bluetooth module connector.

Contact contamination

In some cases, a layer of dirt may be the cause of a poor connection. After storing the device for a long time, particles of dust and dirt accumulate on the connection connector, causing oxidation of the metal. This problem is not difficult to detect. Just look at the connection elements. Brown or green deposits will be visible on their surface.

Lack of sound card drivers

This detail is present in any gadget. The sound card is responsible for the process of converting audio and digital streams. However, for proper operation of the connected gadget, you must install software - drivers that correspond to the operating system of the main device and the technical parameters of the microphone. Most often, the required driver package is present in the standard software of the motherboard. However, when updating the system or reinstalling it, the drivers must be installed again.

"Waste of money"

But according to Knoles, using ultrasound technology in such countries would be crazy. People need to protect themselves with bed nets, ointments and anti-malarial medicines, he said. If they rely only on ultrasound and stop using other means of protection, they will be putting themselves at risk.

The Brazilian radio station's broadcast of the so-called mosquito-repellent sound was not the first of its kind. But earlier the idea did not take root.

Electronic ultrasonic devices advertised as a mosquito repellent are better known around the world.

In 2005, consumer magazine Holiday Which? tested several mosquito repellent devices. Four of them used an ultrasonic signal. The magazine's editor, Lorna Cowan, called them a waste of money and demanded they be withdrawn from sale.

One device called the Lovebug, shaped like a ladybug and designed to be used in a baby's crib or stroller, has caused particular concern. This is due to the fact that by purchasing such a device, parents will believe that their children are sufficiently protected from mosquitoes, as a result of which children may suffer from insect bites.

This device is still available in Europe, although sales in the United States have been stopped due to a Federal Trade Commission enforcement action against the device's manufacturer, Prince Lionheart.

Company president Kelly McConnell told the BBC that Lovebug has been “successfully used around the world,” and the best proof of its effectiveness comes from satisfied customers.

Other manufacturers of similar devices also claim that a huge number of buyers of their products were satisfied with their purchases.

Why does it sit on a person?

The appearance of an annoying insect in the house rarely goes unnoticed. A visit is not always associated with a desire to warm up or get some food. People interpret contact with an uninvited guest from different angles.

Adherents of logical explanation believe that a fly landing on a person does not in itself carry a semantic load. Its appearance is most likely associated with the odor of sweat and sebum that the body secretes. This aroma does not attract people around, but has a magical effect on the insect.

If you believe superstitions, then the unexpected guest is far from interested in the attractiveness of the human body. An arriving insect can tell about the human aura and indicate upcoming events.

Got tangled in my hair

Esotericists recommend paying attention not only to the fact of close contact between an insect and a person, but also to the place. According to the sign, if a fly tries to get tangled in the hair, then a married or loving couple should expect a quick separation

But superstition does not indicate the duration of the separation.

According to the sign, if a fly tries to get tangled in the hair, then a married or loving couple should expect a quick separation. But superstition does not indicate in any way the duration of the separation.

For a lonely girl, a fly in her hair portends an imminent marriage, and many insects indicate an improvement in her financial situation.

To protect yourself and your life partner, as well as to eliminate the possibility of a bad omen coming true, superstitions recommend spending the evening without your significant other on this day.

Sat on my nose

The annoying insect that appeared in the apartment is perceived by the people as a harbinger of various events. If a fly lands on your nose, then you should expect quick fun or a feast with family and friends. But this is far from the only interpretation of the sign:

• An uninvited guest is trying to bite your nose - the weather is expected to worsen and cold weather will set in.
• A fly entering the nostril foreshadows the visit of guests. If it has crawled too deep, then you should be wary of the visit of strangers with bad intentions.

Got in the eye

The appearance of a fly in the house is not always interpreted in a positive way. According to the sign, an insect caught in the eye foreshadows imminent tears and disappointment. But no one says with certainty what can cause them.

Troubles that make a person cry can affect both finances and personal life.

In the mouth

An annoying insect that constantly circles around your face often causes irritation and anger. In the old days, flies were wary of this behavior:

• A guest who flies in and tries to get into the mouth warns of the need to watch her tongue. If you say too much, the risk of paying for what you said increases. To avoid trouble, it is recommended to keep your mouth shut.
• A fly caught in the mouth from a drink or with food indicates an unexpected increase in income or winnings. And if you happen to swallow an insect, then a joyful event will soon happen in the family.

In ear

In some cases, contact between an insect and a person can protect you from various kinds of troubles:

• If a fly has flown into your ear, then you should be wary of evil gossip spread by envious people and enemies.
• This behavior of an uninvited guest is often perceived as a warning sent from deceased relatives or friends. In such cases, it is recommended to refuse risky and dubious offers so as not to incur trouble.
• In the world of signs and superstitions, there is an opinion that a fly flying into the ear also portends criticism.

Why do mosquitoes squeak, how do they manage to make a squeak and not a buzz?

Everyone is familiar with the squeak of a mosquito. An annoying buzzing indicates that there is a small bloodsucker nearby who is preparing to attack. But few people know why the insect begins to squeak and why it notifies of its approach, because sound signals give it away.

There are several causes of mosquito squeaking, established by entomologists. Some people mistakenly think that the bloodsucker makes sound with its mouthparts. But in reality, this is explained by a number of other surprising factors.

For example, an insect does not make high-pitched sounds on purpose, but during flight, which is explained by its physiological characteristics.

Autumn burner

Many people notice that by the end of summer the flies seem to become angrier. Now they are not only annoying with their buzzing and crawling over the body and food - they sting painfully. And many are interested in why flies bite in August.

People used to say: flies take revenge on people because they will see the next spring, and insects will die. But all this, of course, is a myth. It arose from simple ignorance. After all, people blame the bites of ordinary house flies, believing that for some reason they suddenly changed their eating habits.

But in fact, they incorrectly answer the question of why flies bite in August. It’s just that during this period the life cycle of a special type of fly begins, called flies.

These dipterans are extremely fertile. They leave their eggs everywhere, laying them many times during the season. Therefore, in August there are countless numbers of them flying. These insects bite painfully because they feed exclusively on blood, piercing the top layer of skin with their sharp proboscis.

These bites are not only painful. Burner flies are carriers of dangerous viruses and infections. Therefore, you should, if possible, protect yourself and your children from them: install protective nets on windows, use repellents while walking.

In addition to true bloodsuckers - mosquitoes and bedbugs, there are also some types of flies that happily join this category of insects. The question here is not whether flies actually bite or not, but which flies and why flies bite in August or autumn. Oddly enough, it is not the usual house flies that attack humans, whose mouthparts are not adapted for biting. The main predators living in Russia and attacking humans are:

Why the squeak?

Many insects buzz, but the mosquito squeaks. Why is that? The whole reason is the size of the insect itself. It is quite small in size, and its wings are too thin and narrow. Therefore, its flight generates a signal of the highest pitch, which is perceived as such a sound.

It squeaks and doesn't buzz.

For comparison, the frequency of oscillatory movements produced by the wings of a mosquito reaches 1000 hertz or more, and by the wings of a bumblebee - 130-240 Hz . Therefore, they do not produce a thin sound, like a mosquito, but a bass sound. The flight of butterflies is completely silent, because the frequency of movements of its wings varies from 5 -9 Hz. The exception is a butterfly called the hawk moth, which creates a squeak.

Ubiquitous mosquitoes

Let's talk about mosquitoes now. There are 120 species of blood-sucking mosquitoes on Earth. Mosquitoes “take wing” and begin an active flight life when the air temperature steadily exceeds +14 °C. Check it out! Mosquitoes, like snakes, cats and some other animals, have special “thermal locators”. With their help, mosquitoes find their victims. Only females suck blood. But each one can make up to 8 passes per night! Therefore, there may be only 2-3 mosquitoes in the room at night, but it seems to us that there is a whole flock of them. But you can still fight them. Mosquitoes are afraid of the smell of cloves, valerian, anise or wild Caucasian chamomile. And here's what's interesting. The mosquito, despite its many legs, cannot walk! Therefore, when there are a lot of mosquitoes on the street, it is not at all necessary to cover the windows and vents with fine gauze. You can limit yourself to a large mesh - and there will be enough air in the room, and no mosquito will fly by! People often wonder why mosquitoes sit upside down on the ceiling? It turns out that everything is very simple. Warm air, as we know, rises and accumulates near the ceiling. And mosquitoes love warmth!

Insects are “healers”. Fly larvae are small worms that disgust most people. But it turns out that they are excellent healers. In some clinics, doctors conducted such experiments. They released these larvae onto the affected rotting tissue of a sick person. And a miracle happened. The fly larvae immediately got down to business: they ate away the diseased tissue and disinfected the healthy one!

At the same time, the patients almost did not notice the presence of “healers” in the wound. True, it feels a little uncomfortable that someone is eating you up.

A little more about insects. In many countries in Asia, Africa, and South America, insects are eaten. Moreover, a person is an omnivore, and there are many insects, and they are very high in calories. After all, the total weight of all insects is almost 4 times the weight of all mammals on Earth! How would you like roasted caterpillars with green peas and mayonnaise prepared in China, or smoked fly larvae? Real jam! By the way, all insects have a complex structure. Do you know, for example, where a grasshopper’s ears are? On foot! The science that studies insects is called entomology. In Greek "entoma" means insects.

Who's the fastest?

Well, who is the fastest on Earth? Look at Figure 15. A bumblebee or a bee is flying at a speed of 18 km/h. It turns out that an elephant can run almost the same speed, despite its external clumsiness. A person runs almost twice as fast as an elephant, and our fly flies almost 7 meters per second or 25 km per hour. A crow can fly 50 kilometers in an hour. But she can easily be overtaken by an ordinary swift, which flies 2 times faster. The shark reaches speeds of up to 80 km/h, so few people will be able to escape from it.

About the speeds of other animals. And at what speeds do animals move that are not “lucky enough” to get into our Figure 15? A duck flying at a speed of 27 m/s will outpace a capercaillie flying at a speed of 16 m/s. The horsefly, flying 14 m/s, will lag behind the capercaillie. The wolf, fox and dragonfly can reach speeds of up to 10 m/s. Well, the wild boar, elk and dung beetle are not in a particular hurry - their speeds do not exceed 8 m/s. But the brown hare has no time to cool off - he rushes at a speed of 10-12 m/s!

Riddles of fast running. There is one type of small lizard on Earth that runs very fast on... the surface of the water! For a long time, scientists could not understand how they manage to do this? It turned out that the membranes on the paws of these lizards create air bubbles just under the surface of the water. And these bubbles are enough for the lizard not to drown and take each subsequent step! But for this you need to walk very quickly. Scientists decided to calculate how fast a person must move in order to, like these lizards, walk on water without getting their feet wet. As a result, it turned out that I had to run at a speed of 110-120 km/h!

The machine buzzes or crackles

With sound in the form of buzzing it’s a little more complicated. If you hear a buzzing from your switchboard, and not a dull hum, urgently look for the cause, otherwise disaster will come to pass.

This sound is caused by a small electric arc that occurs when there is poor contact. This noise may come and go.

Your primary task is to determine the specific location where this sparking source appears by turning off all the machines in the row one by one. At the same time, do not turn off the load from the sockets, otherwise the crackling sound may disappear.

When you have found the culprit, carefully examine his contacts. Unlike the first case (humming), the modular machine itself or its internal components may have nothing to do with it.

As a rule, the culprit is insufficiently good contact at the point where the cable cores are connected to the terminal.

What to do if you examined all the contacts, but did not find any visible traces of sparking or burning? In this case, turn off the voltage in the entire panel room by unclipping the input load breaker.

Next, use a screwdriver to tighten the screw terminals of all switching devices in the panel.

If you have a special insulated electrician's screwdriver, then this can be done without completely cutting off the electricity.

After this, turn on the entire load again. If the sound still does not disappear, then change the culprit machine.

You can’t leave everything as it is, even if there are no visible traces of melting. Do not forget that most often the source of fire in an apartment or house is the electrical panel. And it all starts with a small machine gun.

It is in the switchboard that the entire load is concentrated and all the devices and switching wires are most densely located.

As soon as an open electric arc occurs, it will immediately transfer to all neighboring elements.

By the way, if not quite perfect, but more or less working protection has already appeared against sparking in sockets, in the form of UZM-51MD or UZIS, then the switchboard itself is practically not protected from this in any way.

It should be noted that the work of re-tightening all contacts must be done at least once a year. Even if nothing buzzes or sparks.

Moreover, it is not known with what force they were tightened.

Maybe they didn’t reach the inconspicuous 0.1 newton meter. And he subsequently played his role.

Therefore, an annual audit guarantees the safe and reliable operation of all protective devices in the switchboard. From automatic machines to RCDs and various relays.

Visually, the place of heating may not be noticed. Initially, a small dark spot forms on the side of the body.

If your machine gun is in the middle of the whole assembly, then you will definitely miss it.

But if you miss this moment, traces of burning and melting appear on the terminal. At the same time, due to the protective casing, the external door on the electrical panel or an incorrectly installed seal, you will not see them until a distinct smell appears.

Machines with such melted contacts are also subject to replacement. Most often this occurs when connecting aluminum conductors.

For example, when connecting a SIP wire to an input circuit breaker.

Another such poor contact can occur when several wires of different cross-sections are connected to one connector.

This will already be a “jamb” and the fault of the electrician, and not the manufacturer of the machines. Another common mistake is pinching the wires together with the insulation in the terminal.

You won't notice this until you loosen the clamp and pull the core out. All this gradually leads to heating.

As a rule, the appearance of buzzing sounds may be preceded by the formation of foreign odors. So there is nothing wrong with periodically “sniffing” your shield room.

If a smell appears, this indicates the beginning of the process of destruction and melting of the plastic housing of the protective device.

In this case, you need to immediately turn off the power to the entire apartment and find the defect. Often, along with the machine, you have to replace burnt wires.

With such melted insulation, it is no longer possible to connect the wiring to a new device.

How do flies and mosquitoes make sounds?

Now it’s time to talk about the mosquito. In flight, mosquito wings flutter and oscillate, also making a sound. This sound is subtle because the mosquito flaps its wings very quickly.

And the fly flaps its wings much more slowly. In this case, the sound turns out to be somewhat rougher, so it does not squeak, but buzzes.

Now you know why a fly makes a buzzing sound and a mosquito makes a squeaking noise. Other flying insects - bees, wasps, beetles, etc. - make sounds in the same way.

The only insect that we don't hear flying is the butterfly. The butterfly flies silently because its wings are large, light and soft. She waves them slowly and therefore the human ear is not able to hear the flight of the butterfly.

Tasks

For classes on the topic “Insects,” offer children the following tasks based on pictures:

Tell me who is in front of you. Ask to describe the insect shown in the picture

It is important to note the appearance: body, wings, legs; coloring; habitat zone; benefit or danger to humans. Compare two similar butterflies, beetles, dragonflies. List all their common features and differences. Count to 5 (one butterfly - two butterflies - three, etc.

d.) Each time you can take the name of another representative of the family (mosquito, beetle, caterpillar, etc.) Call it affectionately: mosquito - mosquito, beetle - bug, bee - bee. Tell us about insects that are beneficial. What are they needed for? How do they help a person? Think about why insect bites are unpleasant to humans? How to protect yourself from dangerous representatives of this family? What sounds do insects make? Make this sound:

Beetle - buzzes (zzzzzzhzh) Bumblebee - buzzes (uuuuuuu) Mosquito - squeaks (eeeeee)

What insects can do, what they do:

A butterfly flutters, spins, sits on a flower, drinks nectar. Ant - runs, hurries, builds an anthill, hides from a thunderstorm. Beetle – Caterpillar – Mosquito – Dragonfly –

Name insects that:

- can fly; - build a house for themselves; - buzzing; – bright colors; - they bite painfully.

Come up with a sentence with these three words and choose the corresponding picture:

– a big bumblebee to fly; – butterfly delicate wings; – dragonfly with big eyes; – a thin mosquito squeaks; – beetle falling leaf; - The ant is running along the path.

• Based on the picture, ask as many questions as possible about one insect or different ones depicted in the story picture.
• Write a short story about two or three different insects shown in the picture (cards must be chosen at random). With children 5 years old and older, you can use all the illustrations at once, but with kids it is better to take out one after another.
• Come up with funny short poems about those who circle over a meadow or live among the blades of grass in a clearing or forest edge. Rhyme search exercises are a great way to train a child’s phonemic hearing and imagination.