Прочитайте текст и определите какой из заголовков соответствует тексту A diode is a two-element elec...: ответ на тест 606813 - Английский язык

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A diode is a two-element electron tube that consists of a cathode and an anode or plate acting as an electron collector. By applying a positive voltage to the plate of a diode, an electric field is established between cathode and plate that attracts electrons emitted from the cathode to the plate.

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A diode is a two-element electron tube that consists of a cathode and an anode or plate acting as an electron collector. By applying a positive voltage to the plate of a diode, an electric field is established between cathode and plate that attracts electrons emitted from the cathode to the plate.

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Plate current is the flow of electrons from cathode to the plate and their return to the cathode through the external circuit. Plate current flows in a diode when the plate is made positive with respect to the cathode. No current flows when the plate is negative with respect to the cathode. This is called unidirectional conduction.

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The cloud of electrons formed in the space between cathode and the plate is called space charge. The space charge is negative and hence has a repelling effect on electrons emitted from the cathode. The amount of the plate current depends on the space charge and the relative strength of the electric field set up by the positive plate voltage.

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The electron beam may be deflected either electrostatically or magnetically. Let us consider electrostatic deflection. An electrostatic field can be produced between two metal plates simply by applying a potential difference between them. Electrons entering the field between the deflecting plates will be bent in the direction of the lines of force, that is, they will be attracted toward the positive plate. The resultant path of the beam will be the net effect between its forward velocity and its deflection. As a result the electron spot is deflected upward or downward depending upon the polarity of the voltage on the plate.

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Now let us turn to cathode-ray tubes (abbreviated CRT) that provide a visual representation of voltage and current waveforms. Cathode-ray tubes consist of three basic components: 1. the electron gun, 2. a deflection system, 3. a fluorescent screen. These essential parts of a cathode-ray tube are mounted inside a highly evacuated, funnel-shaped glass envelope the large end of which has the fluorescent screen coated upon the inside surface.