The current varying sinusoidally in a re

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Target Exam

CUET

Subject

Physics

Chapter

Alternating Current

Question:

The current varying sinusoidally in a resistive circuit is zero. Which of the following is NOT true?

Options:

The voltage and current are in phase.

The power dissipated in the circuit is zero.

The sum of the instantaneous current values over a complete cycle is zero.

The power dissipated in the circuit is non-zero.

Correct Answer:

The power dissipated in the circuit is non-zero.

Explanation:

Joule heating is given by I² R and depends on I² (which is always positive whether i is positive or negative) and not on I.