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The power factor of an $\mathrm{AC}$ circuit containing peak current $2 \mathrm{~A}$ and peak voltage $1 \mathrm{~V}$ is $1 / 2$, then the angle between voltage and current is
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$60 ^\circ$
Power Factor $=\frac{1}{2}$
$\begin{aligned} & \Rightarrow \quad \frac{1}{2}=\cos \phi \\ & \Rightarrow \cos \phi=\cos 60^{\circ} \Rightarrow \phi=60^{\circ}\end{aligned}$
$\begin{aligned} & \Rightarrow \quad \frac{1}{2}=\cos \phi \\ & \Rightarrow \cos \phi=\cos 60^{\circ} \Rightarrow \phi=60^{\circ}\end{aligned}$
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