Electrical power
For DC or an ideal resistive AC load. Other AC loads require a power factor.
DC power = voltage × current
Formula
Voltage × current
How the calculation works
Calculate electrical power for DC or ideal resistive loads. Enter each measurement in the unit shown beside the input. The result updates when you change a value; incomplete or unsupported inputs display an explanation.
Worked example
12 V × 2 A = 24 W.
When to use this calculator
Use this for a basic DC electrical power calculation.
Common mistakes and limits
General AC real power also depends on power factor. Three-phase circuits require a different formula.
Check your result
Check that all measurements describe the same object or time period. Repeat the calculation with unrounded values, then round only the final quantity to a precision suitable for the task.
Frequently asked questions
Does this calculator need an account?
No. Calculations run in your browser without an account.
How precise is the displayed result?
The display rounds to six decimal places. Measurement uncertainty can be larger than this rounding.
Sources & references
- Electrical Energy and Power — OpenStax
