GEORG SIMON OHM (1789-1854)

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.

greek symbol capital ohm (480 x 480)

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 VI and R, Ohm’s law can be written in units as:

volts = ampere × ohm

photograph of george simon ohm © + diagram of simple electric circuit

GEORG OHM


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HANS CHRISTIAN OERSTED (1777-1851)

1820 – Denmark

‘Electric current produces a magnetic field’

drawn portrait of HANS CHRISTIAN OERSTED ©

Oersted discovered that an electric current could make the needle of a magnetic compass swivel. It was the first indication of a link between these two natural forces. Although Oersted discovered electromagnetism he did little about it. This task was left to AMPERE and FARADAY.

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