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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) 2ohmThis 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

Answer»

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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