Questions
The power factor in a circuit connected to an A.C. The value of power factor is
a
Unity when the circuit contains an ideal inductance only
b
Unity when the circuit contains an ideal resistance only
c
Zero when the circuit contains an ideal resistance only
d
Unity when the circuit contains an ideal capacitance only
detailed solution
Correct option is B
cosϕ=RZ, where Z is the impedance & Z=R2+(XL−XC)2, if there is only resistance then Z=R⇒cosϕ=1Talk to our academic expert!
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In the series LCR circuit as shown in figure, the heat developed in 80 seconds and amplitude of wattless current is:
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