State Ohm's law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.

Explanation

Ohm.s law : It states that the current flowing in a conductor is directly proportional to the potential difference across its ends provided the physical conditions and the temperature of the conductor remains constant i.e., `VpropIorV=IR`
where R is a constant called resistance of conductor.