Write a note on resistance and ohm's law?


The ohm law is one of the most important and popular laws that help us describe the relationship between current (I), voltage (v) and resistance (R). A German physicist named Georg Simon Ohm first developed the law, and it was the most important theory that explained the quantitative characteristics of the physics of electricity.

What is Ohm’s Law?

Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Ohm’s law formula is written as

V ∝ I

V = IR


R = Resistance (Constant value)

The resistance value depends on the material of the conductor and dimensions of the conductor. The SI unit of resistance is Ohm (Ω).

Applications of Ohm’s law

  • When the other two quantities are known to us, Ohm’s law helps us determine either the voltage, current or impedance or resistance of a linear electric circuit.
  • It also enables the calculation of power easy.

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