Вопрос № 237508 - Английский язык

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The vacuum tube, just as the transistor, is the amplifier of the current.

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Intensive 1______________ of radio-location began in the early forties. All these years the vacuum tube was the heart of electronics and, hence, the field of electronics was usually 2_______________ as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled quantities of gas introduced into a "vacuum tube" could make it perform switching, 3______________ and other jobs. To include the category of gas-filled tubes, "vacuum tubes" became converted to "electron tubes" and the science of electronics was expanded to include the study of electron motion in  4______________.

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An electrical signal applied to the base influences the semiconductor material's ability to conduct electrical current.

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Silicon devices are the constituents of about 50 percent of all semiconductor products sold nowadays.

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In circuits small paths of metal work act as wires.

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Solar cell is any device that directly converts the electrical energy into light.