Question

In a purely resistive circuit:
A.) Current lags behind the voltage by 90°
B.) Current leads the voltage by 90°
C.) Current can lag or lead the voltage by 90°
D.) Current is in phase with the voltage

Answer 1

Hint: A purely resistive circuit is a circuit which has such a small inductance that its reaction to its typical frequency is negligible compared to its resistance.

Step By Step Answer :

The circuit containing only a pure resistance of $R\;\Omega $ pure Resistive AC Circuit is known as the AC Circuit. A purely resistive circuit does not have the presence of inductance and capacitance. The alternating current and voltage both pass forward and reverse in both circuit directions.

Thus, alternating current and voltage follow a Sine wave shape that is also known as the sinusoidal waveform.

In a strictly resistive circuit, the inductance is very small, so that the reaction is negligible in comparison to its resistance at its normal frequency. In addition, in this circuit the entire voltage used is consumed in overcoming the circuit itself's ohmic resistance. It's also called a circuit but is not inductive. The phase angle between current and voltage is zero in a purely resistive circuit, too. If we were to express the instantaneous current and instantaneous applied voltage of a typical circuit type, it would indicate that the voltage and current supplied are actually in phase with each other.

Hence option D is the correct answer and as per this in a purely resistive circuit the current is in phase with the voltage.

Note: For solving these types of questions we must remember the property of the circuit mentioned in the question. In this the pure resistive circuit is mentioned and we must remember how current flows in these types of circuit and its properties.