Question: What is the power factor in an AC circuit?

Options:

1. The ratio of real power to apparent power
2. The ratio of voltage to current
3. The total power consumed
4. The phase difference between voltage and current

Correct Answer: The ratio of real power to apparent power

Solution:

The power factor is defined as the ratio of real power (P) to apparent power (S) in an AC circuit, indicating how effectively the current is being converted into useful work.