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Dev Kumar
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Asked: 2020-10-20T12:00:21+00:00 In:

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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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

2020-2021cbsechapter 12class10electricityncertscience
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    2 Answers

    1. Best Answer

      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

      For more answers visit to website:
      https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-12/

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    2. 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

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