### Q.8:- When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

**Answer:-**

We have potential difference (V) = 12V

Electric current (I)=2.5 mA= 2.4×10^{-3}

According to Ohm’s Law (V) = IR

Or R = V/I