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Which of the following is used to switch heavy loads?

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Which of the following is used to switch heavy loads?

(a) fet

(b) transistor

(c) buffer pack

(d) darlington pair

The question was posed to me in an international level competition.

The question is from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems

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The correct option is (a) fet

For explanation: The field effect transistor can be used to provide a very high effective gain and hence they can be used to switch heavy loads easily from a logic device. These are also voltage controlled transistors.

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