Ohm’s law calculator
Ohm’s law links voltage U (volts), current I (amperes) and resistance R (ohms). With any two of them you can find the third and the dissipated power P (watts). Enter the values you know.
Enter two values, the third is computed.
- Voltage U
- 240 V
- Current I
- 12 A
- Resistance R
- 20 Ω
- Power P
- 2880 W
Indicative result: always verify against the standards and the installation method on site.
Formula
U = R × I · P = U × I = R × I²
Good to know
- Valid for DC and, in AC, for a purely resistive load.
- For a motor or an inductive load, use the motor current calculator (cos φ).