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# State **Ohm's law**. Give **Mathematical relation** between potential difference (V), Current (I) and resistance (R) of a conductor. **Draw an electric circuit **for studying ohm's law.

**Ohm's law : **

Ohm's law states that at a constant temperature, the **current passing through a conductor is directly proportional to the potential difference** applied across it.

So, potential difference V is directly proportional to the electric current I.

Or, $V \propto I$

$\mathrm{Or}, \frac{V}{I}=Constant$

This

**constant is called resistance R**. Resistance is the property of conductor which resists the flow of electric current through it.Therefore, $\frac{V}{I}=R$

$\mathrm{Or}, \frac{1}{I}=\frac{R}{V}$

$\mathrm{Or}, I=\frac{V}{R} $

$\mathrm{Or}, V=R I$

The following electric circuit is used for studying Ohm's law.

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