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The maximum efficiency of resistance loaded class A power amplifier is ____________

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The maximum efficiency of resistance loaded class A power amplifier is ____________

(a) 5%

(b) 35%

(c) 25%

(d) 50%

This question was addressed to me in an international level competition.

My question is from Class A Output Stage topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct choice is (c) 25%

To explain I would say: The theoretical maximum efficiency of a Class A power amplifier is 50%. In practice, with the capacitive coupling and inductive loads (loudspeakers), the efficiency can decrease as low as 25%. This means 75% of power drawn by the amplifier from the supply line is wasted.

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