Question

The power factor of a series LCR circuit at resonance will be ______.

Options

• 1

• 0

• 1/2

• `1//sqrt 2`

Answer 1

The power factor of a series LCR circuit at resonance will be 1.

Explanation:

At resonance in a series LCR circuit, inductive reactance (XL) and capacitive reactance (XC) become equal and cancel each other. Hence, impedance becomes purely resistive, and the phase angle is zero. Therefore, power factor (cos Φ) = 1.