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 draw
400W
Current
2A
Resistance
100Ω
Power draw
400W
Voltage
200V
More about: Power Dissipation Calculator (P = I² × R)
What it calculates
The “Power Dissipation Calculator (P = I² × R)” calculator computes Power draw 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 current i and resistance r — each field above is adjustable with a slider.
- Power draw (W) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Power Dissipation Calculator (P = I² × R) calculated?
The Power Dissipation Calculator (P = I² × R) calculator computes Power draw (in W) from current i, resistance r. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Power Dissipation Calculator (P = I² × R) calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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