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What is the power factor of a purely resistive AC circuit?

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Question: What is the power factor of a purely resistive AC circuit?

Options:

  1. 0
  2. 0.5
  3. 1
  4. Infinity

Correct Answer: 1

Solution: 

The power factor is defined as the cosine of the phase angle between voltage and current. In a purely resistive circuit, this angle is 0 degrees, so the power factor is 1.

What is the power factor of a purely resistive AC circuit?

Practice Questions

Q1
What is the power factor of a purely resistive AC circuit?
  1. 0
  2. 0.5
  3. 1
  4. Infinity

Questions & Step-by-Step Solutions

What is the power factor of a purely resistive AC circuit?
Correct Answer: 1
  • Step 1: Understand what a power factor is. It is a number that shows how effectively electrical power is being used in a circuit.
  • Step 2: Know that the power factor is calculated using the cosine of the phase angle between voltage and current.
  • Step 3: In a purely resistive AC circuit, the voltage and current are in sync, meaning they reach their maximum values at the same time.
  • Step 4: This synchronization means the phase angle between voltage and current is 0 degrees.
  • Step 5: Calculate the power factor using the cosine of the phase angle. Since the angle is 0 degrees, the cosine of 0 is 1.
  • Step 6: Conclude that the power factor of a purely resistive AC circuit is 1.
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