Circuit Theorems in AC Analysis

Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.

A 1,027 Hz

B 10,270 Hz

C 6,330 Hz

D 63,330 Hz

ANS:A - 1,027 Hz

For a load to transfer maximum power, its impedance must be equal to circuit impedance, here RW=RS and XL must be equal to XC so as to deliver maximum power.

Hence, 2*pi*f*L=1/(2*pi*f*C); from this the value of f can be determined.

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