Find the Best Online Ohms Law Calculator

Ohms law (V = IR) describes the relationship between voltage, current and resistance in electrical circuits. Ohms law describes that the current flowing through an electrical circuit is directly proportional to the voltage applied between points on the circuit.

Use one of the free online calculators below to explore Ohm's Law and help you complete your physics or engineering homework correctly.

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Who invented Ohms law?

Georg Ohm was a German physicist and mathematician who in 1827 published his book ''Die galvanische Kette, mathematisch bearbeitet' (The Galvanic Circuit Investigated Mathematically) which described Ohms law.

How do you calculate Ohm's Law?

Ohm's law takes the equation form of V = IR where voltage = current * resistance. This relationship states that the electric current in a circuit is directly proportional to the voltage applied to the same circuit. For example, we can use this law to deduce that one amp of current will be pushed through a circuit with one ohm or resistance when you apply one volt to the circuit.