In a purely resistive circuit the current:

Explanation

In a purely resistive circuit, the current and voltage are in phase with each other. This means both reach their maximum and minimum values simultaneously, with no phase shift between them.The reason is that resistance, unlike reactance, does not cause any delay or advancement in the phase of the current relative to the voltage. Therefore, Options A, B, and C are incorrect as they suggest a phase difference, which does not occur in purely resistive circuits. Option D is correct as it accurately describes the in-phase relationship, where the electrical energy is entirely converted into heat without any storage or delay.