In this type of circuit, the terms lead, lag, and in phase are used to describe current with reference to voltage. Current is in phase with voltage when there is no phase shift between the sinusoids describing their time varying behavior. This generally occurs when the load drawing the current is resistive.

What does it mean when current and voltage are in phase?

The voltage and the current are said to be "in-phase" since their zero, peak, and valley points occur at the same time. They are also directly proportional to each other. ... When the change in current is zero, the inductive reactance will be zero and the voltage across the inductor will be zero.

Is current out of phase with voltage?

We say that in capacitive circuit the voltage and current are out of phase. Current is 90 (degrees) ahead of voltage.