Home Physics Alternating Current AC Circuits In a purely resistive ac circuit, the current
Physics Alternating Current AC Circuits Single Correct MCQ
Published on: September 12, 2026

In a purely resistive ac circuit, the current

A
Lags behind the e.m.f. in phase
B
Is in phase with the e.m.f.
C
Leads the e.m.f. in phase
D
Leads the e.m.f. in half the cycle and lags behind it in the other half

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Text Solution

Verified by Experts
The correct answer is:
B
In a purely resistive AC circuit, the relationship between current and voltage (e.m.f.) is defined by Ohm's Law:
V = I imes R, where V is the voltage, I is the current, and R is the resistance.
Since resistance does not create any phase difference between voltage and current, both the current and voltage will reach their maximum and minimum values at the same time.
Therefore, in a purely resistive circuit, the current is in phase with the e.m.f.. Thus, the correct answer is Option B.

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