Question

A phasor is best described as ______.

Options

• A scalar quantity that represents the peak value of AC voltage

• A vector that rotates about the origin with angular speed ω

• A straight line representing the average value of AC current

• A fixed vector showing the direction of current flow

Answer 1

A phasor is best described as a vector that rotates about the origin with angular speed ω.

Explanation:

A phasor is a rotating vector. It rotates about the origin with angular frequency ω, and its vertical projection at any instant gives the instantaneous value of the sinusoidally varying quantity (voltage or current).