Question

In a series $LCR$ circuit, the phase difference between the voltage and the current is $45^?$. Then the power factor will be

• A. $0.607$
• B. $0.707$
• C. $0.808$
• D. $1$

Answer 1

Answer: (B)

$0.707$

Answer 2

Here, $\phi = 45^?$ In series $LCR$ circuit, power factor $= cos\phi$ $\therefore cos\,\phi=cos\,45^{\circ}=\frac{1}{\sqrt{2}}$ $=0.707$.