객관식
The current in an AC circuit takes 0.02 s to change direction. What is the angular frequency of the AC source?
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Alternating Voltages and Currents
객관식
An AC source produces an alternating current in a circuit with the function . What is the frequency of the source? What is the maximum current in the circuit?
A
f=39.8 Hz
B
f=250 Hz
C
f=393 Hz
D
f=1570 Hz
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