How it works
Apparent power is RMS voltage × RMS current, multiplied by √3 for balanced three phase with line-to-line voltage. Real power = apparent power × power factor.
Input definitions
- System
- Choose Single phase / Balanced three phase.
- RMS voltage (V; line-to-line for three phase)
- Enter the value in the labeled unit.
- RMS current (A)
- Enter the value in the labeled unit.
- Power factor
- Enter the value in the labeled unit.
A worked example
- System
- Single phase
- RMS voltage (V; line-to-line for three phase)
- 230
- RMS current (A)
- 10
- Power factor
- 0.8
Assumptions & limits
Use consistent stated units. Ideal geometric or physical model; verify dimensions and applicability before real-world design.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Which voltage is used for balanced three phase?
Enter RMS line-to-line voltage and RMS line current. Harmonics, imbalance and signed leading versus lagging reactive power need a more complete model.
How does AC real, reactive and apparent power work?
Apparent power is RMS voltage × RMS current, multiplied by √3 for balanced three phase with line-to-line voltage. Real power = apparent power × power factor.
What are the limits of AC real, reactive and apparent power?
Use consistent stated units. Ideal geometric or physical model; verify dimensions and applicability before real-world design.