1827 – Germany
‘The electric current in a conductor is proportional to the potential difference’
In equation form, V = IR, where V is the potential difference, I is the current and R is a constant called resistance.
Ohm’s law links voltage (potential difference) with current and resistance and the scientists VOLTA, AMPERE and OHM.
Ohm is now honoured by having the unit of electrical resistance named after him.
If we use units of V, I and R, Ohm’s law can be written in units as:
volts = ampere × ohm