What phase angle exists between voltage and current in a purely resistive circuit?

In a purely resistive circuit, the phase angle between voltage and current is 0°. This means that the voltage and current are in phase, which is a characteristic feature of purely resistive loads. When voltage is applied across a purely resistive load, the current flows in direct alignment with the voltage waveform, rising and falling at the same time.

This in-phase relationship occurs because resistors do not store energy; instead, they consume electrical energy and convert it into heat. As a result, there is no delay or lead between the voltage and current waveforms, and they peak simultaneously. Understanding this concept is crucial when analyzing AC circuits, as it sets the foundation for recognizing how differing circuit components, such as inductors and capacitors, introduce phase shifts in voltage and current.

The other options represent different scenarios found in inductive and capacitive circuits, where the phase angles indicate the presence of reactive components affecting the phase relationship between current and voltage.