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If you connect regular headphones to the microphone input, they can be used as a microphone. Simplified design of headphones and microphone is the same: the membrane is connected to a coil with a wire located in the magnetic field of a permanent magnet. In headphones, during normal use, the current applied to the coil is converted into diaphragm vibrations, while in a microphone, vice versa.
If you find yourself in a falling elevator, the best strategy for increasing your chances of survival is to lie on your back and try to occupy as much of the floor as possible. In this case, the impact force will be maximally distributed over the body surface. It is widely believed that you just need to jump up during the impact, but this is a misconception that hardly anyone is able to accurately guess the time of the collision and jump at the same speed as the elevator falls
To see through glass with a matte surface, just stick a piece of transparent tape on it. Due to the irregularities of the frosted glass, the light is scattered, but the adhesive side of the tape smooths out these irregularities, and as a result, the light passes through as if through ordinary glass. It should be added that if the surface is matte on both sides, this trick will no longer work.
There is an optical phenomenon that can be called an inverted rainbow, although it happens very rarely. Such a rainbow appears only when several conditions are met. There should be a thin curtain of cirrus clouds in the sky at an altitude of 78 km, consisting of ice crystals, and sunlight must fall on them at a certain angle in order to decompose into a spectrum and be reflected into the atmosphere. The colors in the rainbow "upside down" are also the opposite: purple at the top and red at the bottom.
A bird sitting on a wire of a high-voltage power line does not suffer from the current, because its body is a poor current conductor. In places where birds' paws touch the wire, a parallel connection is created, and since the wire conducts electricity much better, a very small current runs through the bird itself, which cannot cause harm. However, if the bird on the wire touches another grounded object, for example, the metal part of the support, it immediately dies, because then the air resistance compared to the body resistance is too high, and all the current flows through the bird.
If a boiled egg is rolled on a smooth surface, it will quickly roll in a given direction and will spin for a long time, while a raw egg will stop much earlier. This is because a tough egg rotates as a whole, while a raw egg has a liquid content that is weakly bound to the shell.
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What does physics study? 7th grade
Why study physics?
What physicists do you know?
Physical phenomena
Physical phenomena
Physics is one of the natural sciences that studies various physical phenomena
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The first radio was not at all like modern radios
The message was transmitted using Morse code
The first message consisted of only 2 words "Heinrich Hertz"
Heinrich Hertz is a German physicist who experimentally proved the existence of electromagnetic waves. The unit of measurement of frequency 1 Hz is named after him.
“I am proud to be born Russian. And if not contemporaries, then perhaps our descendants will understand how great my devotion to our Motherland is and how happy I am that a new means of communication has been opened not abroad, but in Russia ”. Popov A.S.
SOON AS POPOV'S INVENTION STARTED TO BE APPLIED IN THE RUSSIAN FLEET
The Italian inventor Guglielmo Marconi followed Popov's footsteps. He improved Popov's radio receiver and received a patent for it.
Marconi increased the communication range to thousands of kilometers and organized the industrial production of radio receivers. It was with the help of his radio that the SOS signal was sent from the Titanic
In 1909, Marconi received Nobel Prize for his work in the field of radio communications. A.S. Popov had already died by that time.
Years passed, changed appearance radio receiver ...
TVs, radars appeared ...
The time has come for radio telescopes, cell phones ...
Modern information Technology would have been impossible without the invention of A.S. Popov
Radio Day is our common holiday. Congratulations !!!
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Electric current actions class 8
Electric current is the directed movement of charged particles. In metals, such particles are electrons.
It is impossible to see the movement of electrons along the wires, therefore, the presence of current in the conductor can only be judged by its actions on the surrounding objects.
Actions of electric current: thermal and light, chemical, magnetic, mechanical.
Thermal effect of current The thermal effect of current is based on the fact that any conductor through which current flows heats up and gives up its heat environment... This principle underlies the operation of any electric heating device.
The use of the thermal effect of current in everyday life
The light effect of the current The light effect of the current is associated with the thermal one. If a metal body is heated to a certain temperature, then it will begin to glow. This principle underlies the operation of an incandescent electric lamp.
Chemical action of current The chemical action is due to the fact that current passing through solutions and melts of substances can cause a reaction. As a result of the reaction, pure metal will be released on one of the electrodes.
Application of the chemical action of the current Since the mid-19th century, the chemical action of the current has been used to apply thin layers of silver onto a cheaper substrate.
Magnetic effect of current The magnetic effect of current is due to the fact that a magnetic field is created around any conductor with current, which can affect some bodies.
Application of magnetic action of current Electromagnets are the main component of electromagnetic cranes, magnetic locks, electric bells, loudspeaker speakers and telephones.
Mechanical action of the current The mechanical action of the current is due to the fact that a force acts on a coil with a current placed in a magnetic field, causing the coil to turn. This principle underlies the operation of all electric motors.
Application of the mechanical action of current Electric motors are widely used in everyday life, industry, transport.
The magnetic action of the current is at the heart of the operation of electrical measuring instruments (ammeters and voltmeters).
Thanks for attention. We wish you success in your further study of physics!
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Light reflection law
The incident ray, the reflected ray and the perpendicular to the point of incidence lie in the same plane. The angle of incidence is equal to the angle of reflection.
Reflection is specular and diffuse
Reflection of light can occur from the surface of water, glass.
The image in a flat mirror is straight, life-size, imaginary.
In addition to flat mirrors, there are spherical mirrors
Mirrors are the main component of the "Kaleidoscope" toy
This is how a kaleidoscope works
In the mirror maze
Flat mirrors are used in many optical instruments: periscopes, binoculars, etc.
Spherical mirrors are also widely used: in telescopes, searchlights, etc.
Let's solve the problems: Light the bottom of the well. The height of the sun above the horizon.
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The law of refraction of light
Refraction is a change in the direction of movement of a light beam at the interface between two substances.
The incident ray, the refracted ray and the perpendicular to the point of incidence lie in the same plane. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is relative indicator refraction of two media.
Refraction of light on a spherical glass surface is used in lenses.
Lenses are converging and diffusing
Ray path in lenses
Lenses are used in a variety of optical devices
Telescope
Microscope
Projection apparatus
Camera
Human eye - collecting lens
Nearsightedness and hyperopia are treated with glasses
Light of different colors is refracted in different ways, so after passing through a prism, white light is decomposed into a spectrum.
Rainbow - grand a natural phenomenonassociated with the decomposition of white light into a spectrum in water droplets.
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Phenomenon electromagnetic induction Grade 9
What is a magnetic field? What are its main properties? What creates a magnetic field? What does a magnetic field do? What is Oersted's experience? How can you depict a magnetic field in a drawing? What is magnetic flux? What does the magnetic flux depend on?
Energy saving lamps and Bernard the bear So why is the light on? Where else have you encountered a similar phenomenon?
Science Wins When Its Wings Are Unleashed By Fantasy Michael Faraday
Faraday's experiments Helmholtz once said about Faraday: "A little wire and a few old pieces of wood with iron enable him to make the greatest discoveries."
The principle of operation of an electric current generator
Generator at power plant
The generator rotor can be driven by steam
The rotor of the generator can be driven by wind and water
... or maybe a hamster.
Induction electric cooker
Metal detectors
Homework: § 49, 50, answer questions 1 - 7 in writing after § 50, ex. 39.
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Energy-saving lamp Ogorodov Valery 8 class "B"
An energy-saving lamp is an electric lamp with a significantly higher ratio between luminous flux and power consumption compared to incandescent lamps. Thanks to this, their use contributes to energy savings.
Types of energy-saving lamps Fluorescent lamps LED lamps
Fluorescent lamp A fluorescent lamp is a gas-discharge light source. Consists of a tube coated with a thin layer of crystalline powder - phosphor. The tube is filled with an inert gas or a mixture of both. A metered amount of mercury is introduced inside, which, when the lamp is operating, turns into a vapor state. The tube is hermetically sealed. At the ends of the lamp there are caps with contact pins for connecting the lamp to the circuit.
Types of fluorescent lamps Compact fluorescent lamp Linear fluorescent lamp
LED Bulbs LED bulbs use LEDs as their light source. LED is a semiconductor device that creates light when an electric current is passed through it.
Main advantages Energy saving Low heating Long service life Energy saving lamp guarantee
Who Invented the Lamp? The main inventors of the incandescent lamp are T. Edison and A.N. Lodygin. But in fact, this invention is the result of the long work of many people, such as P.N. Yablochkov, V.D. Coolidge, D.W. Swan, and many others.
Radiation of Light People have long noticed that metals, when heated strongly, begin to emit light, the color of which depends on the heating temperature. The action of an incandescent lamp is based on this principle, as mentioned earlier. RED ORANGE YELLOW BLUE WHITE
Early successes The main problem in trying to invent an incandescent lamp was the melting of many metals when heated strongly. To do this, the filament of the light bulb had to be made of metals with a very high melting point. Therefore, the thread of the first lamp (Delarue, 1809) was made of platinum (melting point \u003d 1750), but this was not enough for normal lighting of the premises. In 1838, Jobar invented the first lamp using a carbon rod as a filament.
Edison In the second half of the 1870s, the American inventor T. Edison conducted research work, in which he tries various metals as a thread. In 1879 he patented a lamp with a platinum filament. In 1880 he returned to carbon fiber and created a lamp with a lifetime of 40 hours. At the same time, Edison invented the household rotary switch. Despite such a short lifespan, its lamps are replacing the gas lighting used until then.
Lodygin A.N. Lodygin in the 1890s invented several types of lamps with filaments made of refractory metals. Lodygin proposed to use tungsten filaments in lamps (these are the ones used in all modern lamps) and molybdenum and to twist the filament in the form of a spiral. He made the first attempts to pump air out of the lamps, which kept the filament from oxidation and increased their service life many times over. The first American commercial lamp with a tungsten spiral was subsequently produced under the Lodygin patent. He also made gas-filled lamps (with carbon filament and nitrogen filling).
Modern lamps In modern incandescent lamps, filament is made mainly from tungsten. The bulbs of these lamps are filled with heavy gases, which greatly increases the light output (in the first lamps there was a vacuum). Incandescent lamps have changed a lot during their history and have experienced a lot, it is possible that soon mankind will invent a new type of lamps that will replace modern ones.
Physics is a very difficult but at the same time fascinating subject. It all depends on how the teacher presents information to the students. Even the most complex formulas and laws will be easily remembered if you use physics presentations, where physical phenomena, their causes, laws and formulas, as well as biographies of famous scientists are described in a lively, accessible and interesting form. All presentations contain many illustrations and audio files that can be easily supplemented and changed.
Physics presentations made in powerPoint, here you will find a large assortment presentations on physics, which can be downloaded absolutely free. To do this, go to the selected presentation and click on the "download" button. Before that, you can see each slide and view their description, you do not have to download the files first and only then realize that this is not quite what you need. If you have any difficulties with finding the topic you need, you can use the search in all presentations, enter keyword and we will select the most suitable work for you.
Here you will find presentations on physics for both junior and high school students. Thanks to the clarity, the colorfulness of the slides, the correctly structured and divided into blocks of information, the audience will more easily perceive the subject and better concentrate on the topic.
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Physics presentations are an excellent accompaniment for the lesson, when the teaching material can be memorized and understood without much difficulty. Today, almost every open lesson is taught using these visual aids... This is good, of course, but it's time to conduct regular classes in the form of a lesson-presentation in physics. You will say that this is impossible, since it is expensive to create one electronic product every day. Of course, it is not easy, even for those who are fluent in the program Power point... And what about those who are still communicating with her on "you"? There is a way out, and we are ready to offer it to everyone who loves their work and this difficult school subject!
Download free physics presentations here and any day
So another section on the portal has appeared, where everyone can download free physics presentations on all topics of lessons for all classes. How much free time the teacher will now have, who will use the material suggested by colleagues for work! All interactive manuals, collected from the vastness of the World Wide Web, are arranged by class. Moreover, for each work there is a short annotation article, according to which you can get acquainted with the content of the electronic resource on the required topic.
The world of physics presentations is huge. The collection will be constantly updated, both with the works of teachers and projects of students who are in love with this subject and are ready to make their first discoveries while still within the walls of the school. It is they who are the author of some ready-made presentations in physics that demonstrate the implementation laboratory work... Insanely interesting are research projectswhich students did themselves or under the guidance of a teacher. Such works can be viewed in the classroom, and in additional classes, and during extracurricular activities.
Many presentations on physics according to the Federal State Educational Standard for a modern lesson are offered with notes. All the material can be obtained on the site for free, then why burden yourself with unnecessary work, creating your own resources for the lesson yourself. Let physics never seem like a difficult science to a student, even when they have to learn complex topics from the sections of electrodynamics or optics. And not only a competent teacher who teaches his subject on the very high level, but also ready presentations in physics, download for free which is possible for everyone!
Physics - grade 7
A 7th grade physics presentation is a small discovery of difficult truths. Students begin to study one of the most mysterious subjects of the school course. It is not for nothing that it is introduced in most schools precisely in the seventh year of study. It is not very easy to comprehend the secrets of kinetic energy, power, hydraulic processes. You need to have a special mindset to see ...
Physics - grade 8
Grade 8 physics presentations help modern teacher successfully and clearly explain the most difficult topics and solve difficult problems. Using a wide arsenal available opportunities electronic resources, you can achieve success in mastering a subject that is difficult for many students. The competent use of multimedia aids increases children's interest in learning ...
Physics - Grade 9
A presentation in a physics lesson in grade 9 becomes integral part learning process. And it doesn't matter if the teacher has a textbook by Peryshkin or other authors on his desk, each of the proposed section can download additional materials for free to make the new lesson interesting and the perception of the material easy. Only in such cases will schoolchildren be able to deal with ...
Physics - grade 10
Presentations are used in physics lessons in grade 10 in almost all schools. This is the clarity that makes it easier for the teacher to explain new topic, when carrying out verification, laboratory and control work, when summarizing the material and even in working with individual students. Free download of electronic resources is offered for various teaching materials from this ...
Presentation Mail Presentation on the topic "Mail" by english language executed for a lesson in grade 3 using the educational complex of Biboletova. Together with the electronic resource, the teacher can download ... Presentation Famous Places of Russia Presentation in English offers a trip to famous places in Russia. Use electronic resource it is possible for any class, since its material is not tied to any ... Presentation Months Presentation in English on the topic "Months" is perfect. Thanks to the dynamic design of the slides, vivid pictures and soundtrack, students will not only get acquainted with the name of the months, ...