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Question

A resistor of resistance 2 Ω and an inductor of reactance 2 Ω are joined in series across an AC supply. The power factor is -

A
12
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B
15
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C
13
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D
17
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Solution

The correct option is A 12
Given:

R=XL=2 Ω

Now, impedance,

Z=R2+X2L=22+22=22

Further, the power factor,

cosϕ=RZ=222=12

Hence, option (A) is the correct answer.

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