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In an AC circuit, the power factor...

In an `AC` circuit, the power factor

A

is unity when the circuit contains an ideal resistance only

B

is unity when the circuit contains an ideal inductance only

C

is zero when the circuit contains an ideal resistance only

D

is zero when the circuit contains an ideal inductance only

Text Solution

Verified by Experts

The correct Answer is:
A, D
Power factor `cosphi=R/Z`
when circuit containg only resistance, then
`Z=Rimpliescosphi=1`
When circuit contains only inductance, then
`R=0`
`:. cosphi=0`.
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