# An audio amplifier, represented by the AC source and theresistor R delivers alternating voltages at audio frequencies tothe speaker.If the source puts out an alternating voltage of 15.0V(rms),the resistance R is 8.20, and the speaker is equivalent to aresistance of 10.4, what is the time-averaged power delivered tothe speaker?

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An audio amplifier, represented by the AC source and theresistor R delivers alternating voltages at audio frequencies tothe speaker.If the source puts out an alternating voltage of 15.0V(rms),the resistance R is 8.20, and the speaker is equivalent to aresistance of 10.4, what is the time-averaged power delivered tothe speaker?

2021-03-13

Vrms$$= 15V$$
$$R1=8.2$$ohms
$$R2=10.4$$ohms
$$Rtotal=8.2+10.4 = 18.6$$ ohms
$$Irms=Vrms/R = 15v/18.6\ ohms = 0.8A$$
$$Pav = (I)2rmsR$$ (here it is I square)
$$Pav = (0.8)2 (10.4)$$

$$Pav = 6.76w$$

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