An unknown circuit draws a current of 2 A from a 12 V battery its equivalent resistance is ________________.
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.
(a) What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current. (b) When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.