Electrician Red Seal · Question
An electrician is designing a power circuit for a small workshop. If a resistive load draws 10 A of current from a 120 V AC supply, what is the approximate power factor for this circuit?
For a purely resistive load, the voltage and current waveforms are in phase. When voltage and current are in phase, the cosine of the phase angle is 1, resultin
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Question: An electrician is designing a power circuit for a small workshop. If a resistive load draws 10 A of current from a 120 V AC supply, what is the approximate power factor for this circuit?
Answer options:
- 0.5 leading
- 0.8 lagging ✅ 1.0 (unity)
- 0.7 leading
Correct answer: 1.0 (unity)
Explanation: For a purely resistive load, the voltage and current waveforms are in phase. When voltage and current are in phase, the cosine of the phase angle is 1, resulting in a power factor of 1.0 (unity). Inductive or capacitive components would cause a phase shift and thus a power factor less than unity.
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