This happens when thevoltage across and current through it are in phase (in step). Normallyany component that consists of a pure resistance (i.e. Not having anyinductance or capacitance as a part of it) could be used as a resistiveload.
There is however the special case where there are inductors andcapacitors in the load but their effect cancels out at certainfrequencies (e. G resonance).
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