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
A. 18 W
B. 1.5 W
C. 48 W
D. 72 W
Answer: Option D
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Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is
A. 25 Ω
B. 500 Ω
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When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is
A. Greater than 1.6 kΩ
B. Greater than 120 Ω but less than 1.6 kΩ
C. Less than 120 Ω but greater than 100 Ω
D. Less than 100 Ω
1/R=1/8+1/8+1/8+1/8=1/2
R=2
P=V^2/R
P=(12*12) /2=72W