NCERT Solution for Class 10 Science Chapter 12
Electricity
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-221
Questions No-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.
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According to Ohm’s law, V = IR
⟹𝑅=𝑉/𝐼
Here, V = 12 V and I = 2.5 mA = 0.0025 A
Therefore,
𝑅=12/0.0025=4800 Ω=4.8 kΩ
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Here, V = 12 V and I = 2.5 mA = 2.5 x 10-3 A
∴ Resistance, R = V/I = 12V/(2.5× 103A) = 4,800 Ω = 4.8 x 10-3 Ω