Four 8 Ω 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_____________?
Correct answer: D. 72 W
- A. 18 W
- B. 1.5 W
- C. 48 W
- D. 72 W
Explanation
Four 8 Ω speakers in parallel have an equivalent resistance of 8/4 = 2 Ω. Thus the required power is P = V²/R = 12²/2 = 72 W.
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