Power factor in an AC circuit is:

A V/I

B cos(φ), the ratio of real power to apparent power

C I²R always

D Always unity

✓ Correct Answer: Option B

PF = cos(φ) = P/S = real power / apparent power. PF = 1 for purely resistive loads.

💡 Why is B) the correct answer?

The correct answer to the question "Power factor in an AC circuit is:" is Option B: cos(φ), the ratio of real power to apparent power.

The other options — A) V/I, C) I²R always, D) Always unity — are incorrect for this FE Exam Prep question. As explained above: PF = cos(φ) = P/S = real power / apparent power. PF = 1 for purely resistive loads.

📚 About This FE Exam Prep Practice Question

This 2-level FE Exam Prep question from the Circuits topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free FE Exam Prep practice test or use flashcards for spaced repetition review.

Practice FE Exam Prep Quizzes → Browse All Questions Study Flashcards

Power factor in an AC circuit is:

✓ Correct Answer: Option B

📚 About This FE Exam Prep Practice Question

Related FE Exam Prep Questions