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An AC source is connected to a resistive circuit. Which of the following is true?

1. Current leads the voltage and both are in same phase
2. Current lags behind the voltage and both are in same phase
3. Current and voltage are in the same phase
4. Any of the above may be true depending upon the value of resistance

Correct answer: Current and voltage are in the same phase

Solution

In a purely resistive AC circuit, voltage and current vary sinusoidally with no phase difference. Hence they are in the same phase.

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