An audio amplifier, represented by the AC source and the resistor R in the figur

Question

An audio amplifier, represented by the AC source and the resistor R in the figure below, delivers alternating voltages at audio frequencies to the speaker. If the source puts out an alternating voltage of 15.0 V (rms), the resistance R is 8.20 , and the speaker is equivalent to a resistance of 11.8 , what is the time-averaged power delivered to the speaker? An audio amplifier, represented by the AC source and the resistor R in the figure below, delivers alternating voltages at audio frequencies to the speaker. If the source puts out an alternating voltage of 15.0 V (rms), the resistance R is 8.20 , and the speaker is equivalent to a resistance of 11.8 , what is the time-averaged power delivered to the speaker? An audio amplifier, represented by the AC source and the resistor R in the figure below, delivers alternating voltages at audio frequencies to the speaker. If the source puts out an alternating voltage of 15.0 V (rms), the resistance R is 8.20 , and the speaker is equivalent to a resistance of 11.8 , what is the time-averaged power delivered to the speaker?

Explanation / Answer

rms current = Irms = Vrms/Req = 15/(8.2+11.8) = 0.75 A

through the speaker

Paverage = (Irms)^2*Rspeaker = 0.75^2*11.8 = 6.6375 W <<<--------answer

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