Chapter 11

NCERT
Class 10
Science
Solutions
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.

Question:

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:

Here, V = 12 V, I = 2.5 mA = 2.5 × 10–3 A

Using Ohm’s Law,

R = V/I

R = 12/(2.5 × 10–3)

R = 12 X 103/2.5

R = (120/25) X 103

R = 4.8 X 103Ω

The resistance of a resistor is 4.8x × 10–3 W.

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