Вопрос № 912160 - Английский язык

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An electric current is a flow of electricity. There are two kinds of electricity, positive and negative. Glass rubbed with silk is positively charged, ebonite rubbed with fur is negatively charged.
Like charges repel, unlike charges attract. The leaf electroscope is used to detect, distinguish and measure charges.
The ultimate particle of negative electricity is called the electron; that of positive is called the proton.

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Electricity
1. Electricity is a flow of negative charges called electrons. These electric charges are measured in units called coulombs. Electricity is a very versatile form of energy that can be converted into many other forms of energy, including light and heat, direct current (DC), which flows in one direction only, and alternating current (AC), which changes direction 60 times per second.
2. An electric circuit is an unbroken conducting path from, and back to, a power supply. It has three main parts: the power supply, the conductor, and the load. The power is provided by a generator or battery, the conductor carries the current, and the load is an electric device such as a lamp.
3. Unlike current electricity, static electricity does not flow. It is created when an electrically neutral substance loses or gains electrons, making it, respectively, positively or negatively charged. You can create static electricity by rubbing a balloon on your clothing. Electrons will move from the clothing to the balloon, making the balloon negatively charged and the clothing positively charged. The resulting static electricity on each will attract small, light objects such as pieces of paper.
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The kind of electricity which can be created at friction is called …

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Engineering is a very practical activity. It is the process of applying the latest achievements of science and technology into practice.
1_______. Mechanical engineers are experts in the design and manufacture of tools and machines. 2_______.
Electrical engineering deals with producing and applying electricity in various fields of national economy. 3_______.
Components and equipment for computing and communicating are the products of electronic engineering. 4_______.

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Bikes, planes and cars have wheels and tyres. Locomotives have wheels; they do not have tyres. Bikes have two wheels and two tyres. Planes have wings. Bikes, locomotives and cars do not have wings. Locomotives, cars and planes have engines. Bikes do not have engines.
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Cars do not have …

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Heat causes liquids to expand. This effect is used in the thermostat in Fig. 21.2. An increase in air temperature causes the liquid to expand in the heat sensor. This expansion causes the valve to close and consequently the flow of hot water is reduced.
After a time, the temperature will go down and consequently the liquid will cool and contract. The spring load will now be greater than the liquid pressure and consequently the valve will open. Once again, the hot water flow is increased.
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Heat causes liquids to …

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1. Turn the gear wheel anticlockwise to raise the 1_______.
2. Press the top button to 2_______ the motor.
3. Pull the handle down to cut the 3_______ bar.
4. Turn the bolt 4_______ to tighten it.