Home/
Competitive Exams/
JEE Main & Advanced/
Physics/
Electromagnetic Induction and Alternating Current/
Question 20204
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Wattless Current MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Wattless CurrentMediumQuestion 20204

Question

The component of current that does no work in an AC circuit is:
  1. A
    Active component (I cosφ)
  2. B
    Reactive component (I sinφ)
    Correct
  3. C
    Total current
  4. D
    RMS current

Correct answer

Reactive component (I sinφ)

Explanation

The reactive (wattless) component I sinφ is 90° out of phase with the voltage and does no average work. Only the active component I cosφ (in phase with V) contributes to average power.

Review Electromagnetic Induction and Alternating Current notesStart timed chapter practice