Question
Power factor of an ac circuit is 0.5. What is the phase difference between current and voltage in the circuit?
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Answer
$\cos \phi=0.5=\frac{1}{2}=\cos 60^{\circ}=\cos \frac{\pi}{3}$
Phase difference is $\frac{\pi}{3}$ radian.
Phase difference is $\frac{\pi}{3}$ radian.
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