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In an ac circuit, the power factor
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Verified Answer
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Is unity when the circuit contains an ideal resistance only
Power factor, $\cos \phi=\frac{R}{Z}$
When circuit contains only resistance, then
$\begin{aligned}
& \mathrm{Z}=\mathrm{R} \\
& \therefore \cos \phi=1
\end{aligned}$
When circuit contains only inductance, then
$\begin{aligned}
& \mathrm{R}=\mathrm{o} \\
& \therefore \cos \phi=\mathrm{o}
\end{aligned}$
When circuit contains only resistance, then
$\begin{aligned}
& \mathrm{Z}=\mathrm{R} \\
& \therefore \cos \phi=1
\end{aligned}$
When circuit contains only inductance, then
$\begin{aligned}
& \mathrm{R}=\mathrm{o} \\
& \therefore \cos \phi=\mathrm{o}
\end{aligned}$
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