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Ohm's Law Calculator

Online calculator Ohm's Law calculates the current, voltage and resistance, the units of which can include any SI prefixes, the calculator automatically converts one unit to another and gives a detailed solution.

The calculator calculates:
Current I
Voltage U
Resistance R

Current I

Current I formula The current is a scalar physical quantity determined by the electric charge passing through the cross section of the conductor per unit of time. Based on Ohm's law, the current I is directly proportional to the applied voltage U and inversely proportional to the resistance R. The SI unit of electric current is the ampere.
Voltage U =
Resistance R =
The SI unit of current I

Voltage U

Voltage U formula Voltage is a scalar physical quantity characterized by work when moving a single positive charge on a given section of the circuit. Voltage is a generalized concept of the potential difference between the beginning and the end of a section of a conductor. The SI unit of electric current is the volt.
Current I =
Resistance R =
The SI unit of voltage U

Resistance R

Resistance R formula Resistance is a physical quantity that determines the ability of a conductor to prevent the passage of electric current. The SI unit of electric current is the Ohm. The resistance of a conductor depends on the material of which the conductor is made, and also on its shape and size.
Voltage U =
Current I =
The SI unit of resistance R


See also