# When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit.

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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.

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Here I = 2.5 mA = 2.5 × 10-3 A.

∴ R = $\frac{12}{25\times 10^{-3}}$

= 4.8 × 103

= 4.8 K cal.