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Parallel Circuits

Q1: Four 8  speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers

A 18 W

B 1.5 W

C 48 W

D 72 W

ANS:D - 72 W

1/R=1/8+1/8+1/8+1/8.

R=2ohm,
I=V/R,
=12/2=6A.
P=I^2R.
=6 * 6 * 2 = 72W.



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