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If DC power for a Class A amplifier is 500W and AC power is 150W, what is its efficiency?

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If DC power for a Class A amplifier is 500W and AC power is 150W, what is its efficiency?

(a) 50%

(b) 75%

(c) 20%

(d) 30%

I have been asked this question by my school teacher while I was bunking the class.

My enquiry is from Class A Large Signal Amplifiers in chapter Large Signal Amplifiers of Electronic Devices & Circuits

1 Answer

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Correct choice is (d) 30%

Explanation: efficiency=AC POWER/DC POWER

Efficiency=150/500=3/10

In percentage 3*100/10=30%.

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