What is the power factor of a purely resistive AC circuit?
Practice Questions
1 question
Q1
What is the power factor of a purely resistive AC circuit?
0
0.5
1
Infinity
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.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the power factor of a purely resistive AC circuit?
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.
Steps: 6
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.
