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For a perfect power amplifier output power rating will be ________ if the output impedance is halved.

(a) Halved

(b) Squared

(c) Doubled

(d) Square rooted

I got this question by my college director while I was bunking the class.

This question is from Features of Power Amplifier in portion Power Amplifier of Analog Circuits

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Correct choice is (c) Doubled

Explanation: In the equation of power output for the power amplifier, the power is proportional to the square of the current and inversely proportional to the resistance. If the impedance is halved then power is doubled.

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