A) unity when the circuit contains only inductance
B) unity when the circuit contains only resistance
C) zero when the circuit contains an ideal resistance only
D) unity when the circuit contains an ideal capacitance only
Correct Answer: B
Solution :
Power factor,\[\cos \phi =\frac{R}{Z}\] When circuit contains only resistance, then \[Z=R\] \[\therefore \] \[\cos \phi =\frac{R}{R}=1\]
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