Resistor power
Resistor power: use current, resistance. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
P = I²R
Variables & units
- Current
- A · minimum -1000000000000, maximum 1000000000000
- Resistance
- Ω · minimum 0, maximum 1000000000000
Worked example
Use the displayed example inputs, then follow the substituted values in the solution.
Assumptions
Use DC current or AC RMS current for an ideal resistor.
References
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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