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Question

In an $$AC$$ circuit, the power factor


A
is unity when the circuit contains an ideal resistance only.
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B
is unity when the circuit contains an ideal inductance only.
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C
is zero when the circuit contains an ideal resistance only.
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D
is zero when the circuit contains an ideal inductance only.
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Solution

The correct options are
A is unity when the circuit contains an ideal resistance only.
D is zero when the circuit contains an ideal inductance only.
Power factor, $$\displaystyle\cos \phi=\frac{R}{Z}$$
When circuit contains only resistance, then
$$Z=R$$
$$\therefore \displaystyle \cos\phi=1$$
When circuit contains only inductance, then
$$R=0$$
$$\therefore \displaystyle \cos\phi=0$$

Physics
NCERT
Standard XII

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