Discussion
A power factor of 1 indicates a :
Answer: B
A power factor of 1 indicates a purely resistive circuit.
Power factor is cos φ, where φ is the phase angle between voltage and current. It equals 1 when φ = 0, that is, when the voltage and current are in phase and the circuit as a whole behaves as a pure resistance. This happens in a circuit of resistors alone, and also in an RLC circuit at resonance, where the inductive and capacitive reactances cancel, which is why the answer speaks of the circuit rather than a single element.
A purely reactive element or circuit has φ = 90° and a power factor of 0, so those options describe the opposite case.
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