When a PD of *V* is applied across a resistor, a current *I* flows through the resistor.

It turns out that *V* is proportional to *I* for a lot of common components used in electrical circuits. This relationship is called Ohm’s Law.

where the constant of proportionality *R* has come to be known as resistance.

A word of caution: The symbol *V* is used to denote an electric potential in the Electric Field chapter. Here the same symbol *V* is used to denote a potential difference. In a less messed up world Ohm’s Law should be written as .

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