The power expended doing 100 J of work in 50 s is
A) 1/2 W.
B) 2 W.
C) 4 W.
D) 50 W.
E) 5,000 W.
Answer: B
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a. 1/2 b. 1/3 c. 1/8 d. 3/8 e. 3/5
An AC voltage source, with a peak output of 200 V, is connected to a 25-W resistor. What is the effective (or rms) current in the circuit?
a. 2.8 A c. 4.0 A b. 5.7 A d. 2.0 A
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A superconductor expels any magnetic field from its interior. This is called
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