Purely Resistive Sine Wave
In a purely resistive circuit, the voltage and current are said to be in phase. In practice few a.c. circuits are purely resistive but the example sine wave shows both the current and voltage in phase for theory reasons.
Questions on sine waves appear in the 2330-202, 2330-203, 2330-301 and the 2357-309 exams.
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What does purely resistive mean?
In a d.c. circuit, we do not have the effects that inductance and capacitance have on an a.c. circuit. Therefore a purely resistive circuit is a theoretical circuit that means the current and voltage stay perfectly in phase.