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Question 20195
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Electromagnetic Induction and Alternating Current: Phase Lead — Inductor MCQ

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Phase Lead — InductorEasyQuestion 20195

Question

In a purely inductive AC circuit, the current:
  1. A
    Leads voltage by 90°
  2. B
    Lags voltage by 90°
    Correct
  3. C
    Is in phase with voltage
  4. D
    Lags by 180°

Correct answer

Lags voltage by 90°

Explanation

For an inductor, V = L dI/dt. If I = I₀ sinωt, then V = LI₀ω cosωt = LI₀ω sin(ωt + 90°). Voltage leads current by 90°, equivalently current lags voltage by 90°. Memory: ELI — in an inductor (L), EMF (E) leads current (I).

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