Question

The power factor for an inductive circuit (R-L load), in which the current lags the voltage, is said to be

(a) Lagging

(b) Leading

(c) Zero

Short answer

Answer

Therefore the correct option is (a) Lagging

Step-by-step solution

Use theory of AC circuit for pure inductive load

For a pure inductive load, the voltage into the load is in perpendicular with the load current, where voltage lead current in phase by $\mathbf{90}\mathbf{°}$. In this case power factor is leading.

Thus, the correct option is (a).

Explanation for option (a)

For a pure capactive load, the voltage into the load is in perpendicular with the load current, where voltage lag current in phase by $90°$.in that case power factor is lagging.

Wheras for a pure inductive load, the voltage into the load is in perpendicular with the load current, where voltage lead current in phase by$90°$ .

Thus, the (b) is incorrect option.

Explanation for option (c)

For a pure resistive load, the current into the load is in phase with the load voltage. In this case ,power factor is zero.

Wheras for a pure inductive load, the voltage into the load is in perpendicular with the load current, where voltage lead current in phase by $90°$.

Thus, the (c) is incorrect option.