Moderate

When A.C voltage is applied to an inductor, the:

Correct answer: A. Voltage V leads current I by 90o

  • A. Voltage V leads current I by 90o
  • B. Voltage V leads current I by 270o
  • C. Voltage V leads current I by 0o
  • D. None of these

Explanation

In an AC circuit containing an inductor, the voltage across the inductor leads the current through the inductor by 90 degrees. This phase relationship is due to the behavior of the inductor, which opposes changes in current. When the AC voltage changes, the inductor resists the change by inducing a voltage across itself, which leads to a phase shift between the voltage and current.Mathematically, this relationship can be represented using phasor diagrams or trigonometric functions. At any given instant, the voltage reaches its peak (or zero crossing) 90 degrees ahead of the corresponding current. This phase difference of 90 degrees is a characteristic behavior of inductive elements in AC circuits.

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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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