Прочитайте текст и заполните пропуски подходящими по смыслу словами Thermionic emission is the most ...: ответ на тест 347362 - Английский язык

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Thermionic emission is the most 1_______________and one most commonly used in electron tubes. In this method 2________________ is heated, resulting in increased thermal or kinetic energy of the unbound electrons. Thus, a greater number of electrons will attain sufficient speed and energy 3________________ from the surface of the emitter. The number of electrons released per unit area of an emitting surface is related to the absolute temperature
of the cathode and a quantity of the work 4_______________must perform when escaping from the emitting surface.

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Thermionic emission is the most 1_______________and one most commonly used in electron tubes. In this method 2________________ is heated, resulting in increased thermal or kinetic energy of the unbound electrons. Thus, a greater number of electrons will attain sufficient speed and energy 3________________  from the surface of the emitter. The number of electrons released per unit area of an emitting surface is related to the absolute temperature
of the cathode and a quantity of the work 4_______________must perform when escaping from the emitting surface.

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We are finally ready to apply the knowledge we gained in previous sections about electrons, vacuum 1_________________ and transistors to some practical matters. In the following sections we shall consider a variety of circuits employing electron tubes and transistors. 2_________________ are combinations of tubes or transistors with other components, such as resistors, capacitors and inductors, and form the 3________________ building blocks of electronic systems: radio, automatic computer and so on. To understand the systems, you must be familiar with the circuits that 4_______________ them up.

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Now we shall discuss amplifier circuits, or more specifically, audio amplifiers. 1 _________ is an electron tube or transistor circuit, which 2_________________ up an ac signal applied to its input. It is called a voltage amplifier if the magnitude of the output  3  __________ . From the amplifier is considerably greater than that of the input voltage. As a matter of fact the ratio of the output voltage to the 4__________________ voltage is called the amplification or gain of the amplifier.

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There are 1_______________ power amplifiers. These are similar to voltage amplifiers, except that their main 2__________________ is to supply a considerable amount of 3________________ i. e. voltage times current to the output or load 4________________, although the ac input signal may not draw any grid current and, hence, the input power may be zero.

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually to 2______________ up the voltage to a high level, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac 3_______________ that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.