First slide

Power in a.c. circuit

Question

What will be the phase difference between virtual voltage and virtual current, when the current in the circuit is wattless?

Easy

A

90⁰
B

45⁰
C

180⁰
D

60⁰

Solution

If the current is wattless, then power is zero. Hence, phase difference, $ϕ \approx 90^{\circ} .$

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