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 1

Explanation:

Given: V=12 V

I=2.5 mA

Let the resistance be R

By Ohm's Law,

V=IR

12=2.5×10

−3

R

R=4.8×10

3

Ω

Answer 2

Answer:

Given

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

Find out

We need to find the value of the resistance of the resistor.

Solution

Ohm’s law gives resistance (R) of a resistor as

V= IR

R= V/I

Where, Potential difference, V= 12 V

Current in the circuit, I= 2.5 mA = 2.5 x 10-³ A

12 = 2.5 x 10-³ R

Therefore, the resistance of the resistor is 4.8 x 10³ Ω