Question

The line that draws power supply to your house from street has ______.

Options

• zero average current.

• 220 V average voltage.

• voltage and current out of phase by 90°.

• voltage and current possibly differing in phase ф such that \[|\phi|<\frac{\pi}{2}\].

Answer 1

The line that draws power supply to your house from street has zero average current and voltage and current possibly differing in phase ф such that \[|\phi|<\frac{\pi}{2}\].

Explanation:

AC current is used in power supply to our house from street. AC currents are having zero average value over a cycle.

As the power line is having some resistance. So power factor,

\[\cos\phi=\frac{R}{Z}\neq0\].

So, |ф| < \[\frac {π}{2}\].