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Which of the following amplifier is less efficient than others?

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Which of the following amplifier is less efficient than others?

(a) Class C

(b) Class B

(c) Class A

(d) Class AB

The question was asked in examination.

The question is from Comparison of Amplifier Classes topic in portion Power Amplifier of Analog Circuits

1 Answer

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Best answer
Right choice is (c) Class A

Explanation: Class A amplifiers are the least efficient of all. A maximum of 25% theoretical efficiency is obtainable, 50% for when using transformer or with induced coupling. This wastes power, as well as increases the cost and requires higher rated output devices.

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