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.

NCERT Questions
NCERT Questions
Last updated at Dec. 16, 2024 by Teachoo
Transcript
NCERT Question 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. Potential Difference = V = 12 V Current = I = 2.5 mA = 2.5 × 10−3 A Finding Resistance By Ohm’s Law, V = I R 𝑉/𝐼 = R R = 𝑉/𝐼 R = 12/(2.5 × 〖10〗^(−3) ) R = (12 × 〖10〗^3)/2.5 R = (12 × 〖10〗^3)/25 × 10 R = (12 × 10)/25 × 103 R = (12 × 2)/5 × 103 R = 24/5 × 103 R = 4.8 × 103 Ω R = 4.8 kΩ Thus, resistance is 4.8 kΩ