Power Dissipation Calculator (P = I² × R)
Calculate power dissipated in a resistor from current and resistance (P = I² × R). Free online calculator.
Power Dissipation Calculator (P = I² × R)
Current IA
Resistance RΩ
Power
400W
Current
2A
Resistance
100Ω
Power
400W
Voltage
200V
More about: Power Dissipation Calculator (P = I² × R)
What it calculates
The “Power Dissipation Calculator (P = I² × R)” calculator computes Power in W from 2 parameters: current i (A), resistance r (Ω).
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters Current I = 2 A, Resistance R = 100 Ω the result is 400 W (P = I² · R).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.