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Ohm's Law

The law was named after the German physicist Georg Ohm, who, in 1827 in a treatise published measurements of applied voltage and current through simple electrical ciruits. Mr. Ohms experimental results at the time was a more complex equation, the modern form of his equation is as follows.

Ohm Equation

I = Current / V = Voltage/ R = Resistance


I is the current through the resistance in units of amperes, V is the potential difference measured across the resistance in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current. Knowing any two values of the voltage, current, and resistance, the Ohms Law can be applied.

Ohms Law Chart

This chart shows the forumlas for calculating the Current, Resistance, Voltage, and Watts using ohms law. To use the chart, select the unit to be calculated, then pick one of the three formulas that corresponds to the two known values.

ohms pie chart



Power is the amount of current times the voltage level at agiven point measured in watts or wattage.


Current, measured in ampres or amps, flows from points of high voltage to low voltage points on the surface of the conductor.


Voltage is the difference in electrical potential between two points in a circuit. the current flows pressure is measured in volts.


Resistance, measured in ohms, determines how much current flows through a component and used to control current and voltage levels.


Ohms Law Formulas


I = amps/V = volts/ R = ohms




R = ohms/V = volts/ I = amps




V = volts/I = amps/R = ohms



Ohm's Schematic Symbol














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