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Subjects

Physics

Ohm's Law, Electrical Resistance, and Resistivity

ओम का नियम, विद्युत प्रतिरोध और प्रतिरोधकता

In Class 12 Physics, this topic from Chapter 3: Current Electricity explains how potential difference, current, and resistance are related through Ohm’s law, V = IR. Students examine the meaning of resistance, interpret V–I graphs, and learn how resistance depends on a conductor’s length, cross-sectional area, material, and temperature. The topic also introduces resistivity as an intrinsic property of a material, its SI unit, and its role in comparing conductors and insulators. Examples and numerical problems help connect these ideas with practical circuits.

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