Ohm’s Law Calculator

Ohm’s Law is a fundamental principle in electrical engineering that states the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. It’s represented by the formula V = I × R, where V is voltage, I is current, and R is resistance.

Simply enter any two known values (voltage, current, resistance, or power) into the calculator, and it will automatically calculate the remaining values. You can also select a specific calculation type if you want to calculate a particular value. The calculator works with standard electrical units: volts (V), amperes (A), ohms (Ω), and watts (W).

The standard units used in electrical calculations are:
Voltage (V): Volts, the unit of electrical potential
Current (I): Amperes or amps (A), the unit of electrical current
Resistance (R): Ohms (Ω), the unit of electrical resistance
Power (P): Watts (W), the unit of electrical power

This calculator is designed for DC (direct current) circuits and basic AC (alternating current) calculations where power factor is 1. For more complex AC circuits with reactive components (inductors and capacitors), you would need to consider impedance and power factor, which are beyond the scope of this simple calculator.

Electrical power is the rate at which electrical energy is transferred by a circuit. It’s measured in watts (W) and can be calculated using the formula P = V × I, where P is power, V is voltage, and I is current. Power can also be calculated using other combinations: P = I² × R or P = V² / R.