Прочитайте текст и определите какой из заголовков соответствует тексту A transformer is used to tran...: ответ на тест 347337 - Английский язык

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A transformer is used to transfer energy. Due to the transformer electric power may be transferred at a high voltage and reduced at the point where it must be used to any value. Besides, a transformer is used to change the voltage and current value in a circuit.
A two-winding transformer consists of a closed core and two coils (windings). The primary winding is connected to the voltage source. It receives energy. The secondary winding is connected to the load resistance and supplies energy to the load.

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A transformer is used to transfer energy. Due to the transformer electric power may be transferred at a high voltage and reduced at the point where it must be used to any value. Besides, a transformer is used to change the voltage and current value in a circuit.
A two-winding transformer consists of a closed core and two coils (windings). The primary winding is connected to the voltage source. It receives energy. The secondary winding is connected to the load resistance and supplies energy to the load.

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Current is a flow of electricity through a circuit. Let us consider two main types of current: direct and alternating. A direct current (d.c.) flows through a conducting circuit in one direction only. It flows provided a direct voltage source is applied to the circuit.
An alternating current (a.c.) is a current that changes its direction of flow through a circuit. It flows provided an alternating voltage source is applied to the circuit. Alternating current flows in cycles. The number of cycles per second is called the frequency of the current. In a 60-cycle alternating current circuit the current flows in one direction 60 times and in the other direction 60 times per second.

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Alternating current (a.c.) is converted into direct current by means of a rectifier.
A half-wave rectifier consists of a diode in series with a resistance. In order to put a rectifier into operation, a source of a.c. should be applied to it. When an a.c. source is applied the diode begins to conduct. The rectifier passes currents during positive half-cycles of the applied voltage. That is why it is called a half-wave rectifier. When the device operates direct current (d.c.) flows in the same direction. It is a pulsating current. Since pulsations should be eliminated, a filter is applied. Pulsations are eliminated by means of this filter.

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Electronic computers are widely used in 1____________ research, in planning and controlling our national economy. Very complicated electronic 2____________ control the work of huge plants and power stations; even whole industries are 3______________ by electronic robots. Planes and rockets are also electronically controlled.
Electronics has sharpened our vision and given us chance to see the microworld more clearly. It helps 4___________ discover new and puzzling phenomena of nature.

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The range of radio 1______________ in space is extending more and more. There is every reason to believe that radio links may be set over 2________________ of 100 million kilometers or even more.
Now we cannot imagine our life without electronics.
But it all began with the 3_______________ of radio. It was our Russian scientist A.S. Popov who discovered the principles of 4________________ communication that finally led to the development of electronic tubes for use in various communication devices.