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Which of the following audio speaker will be hard to be driven by a power amplifier?

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Which of the following audio speaker will be hard to be driven by a power amplifier?

(a) 4ohm

(b) 8ohm

(c) 12ohm

(d) 2ohm

This question was posed to me in final exam.

This is a very interesting question from Features of Power Amplifier in chapter Power Amplifier of Analog Circuits

1 Answer

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The correct answer is (d) 2ohm

Explanation: If the resistance of the audio amplifier is less, the output power of the transistor will be high since output current is increasing. Hence to drive a 2ohm speaker amplifier needs double power that for a 4ohm speaker.

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