In an a.c. circuit the instantaneous current is zero when the instantaneous voltage is maximum. The source may be connected to: (A) a pure inductor, (B) a pure capacitor, (C) a pure resistor, (D) a combination of an inductor and a capacitor. Choose the correct answer.

Question

Accepted Answer

(2) A, B and D only. Current is zero when voltage is maximum only if the current lags/leads the voltage by 90°, i.e. a purely reactive (wattless) element. Pure inductor (A), pure capacitor (B) and a pure L--C combination (D) all give a 90° phase. A pure resistor (C) keeps current in phase with voltage, so its current peaks with the voltage. Correct set: A, B and D.

In an a.c. circuit the instantaneous current is zero when the instantaneous voltage is maximum. The source may be connected to: (A) a pure inductor, (B) a pure capacitor, (C) a pure resistor, (D) a combination of an inductor and a capacitor. Choose the correct answer.

Step-by-step solution

Why the other options are wrong