The phase angle between the voltage and current in A.C through a pure inductor is:
Correct answer: B. 90°
- A. 0°
- B. 90°
- C. 60°
- D. 180°
Explanation
The correct answer is 90°. In a purely inductive AC circuit, the current lags the voltage by 90 degrees. This is because inductors resist changes in current, creating a phase difference where the peak current occurs after the peak voltage. Option A (0°) would be correct for a purely resistive circuit, where voltage and current are in phase. Option C (60°) might occur in more complex circuits that have both resistive and inductive components. Option D (180°) describes a purely capacitive circuit, where current leads voltage by 180 degrees.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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