This Ohms law calculator calculates current and resistance according to ohms law ($$V = IR$$) for direct current (DC). Specify at least one of two variables (voltage, current or resistance) and the third variable with power is calculated. The calculator also calculates voltage, current or resistance from power if at least the voltage or the current is specified.
- The ohms law calculator calculates voltage, current, resistance and power according to ohms law i.e. $$V= IR$$.
- Power is calculated as $$P=V I$$.
- Simply delete the field that needs to be calculated.
- At least voltage or current must be specified when power is specified.