Class 10 Physics Electricity OHMs Law

OHM’s Law

OHM’s law states that under no same temperature, electric current flowing through an ideal conductor is directly proportional to the potential difference across its ends.

V ∝ I

V = IR, R – Resistance

  • Resistance is a property of conductor to resist flow of charge through it. Its SI unit is Ohm (Ω).

R = V/I, 1 Ohm = 1 Volt/ 1 Ampere

  • I = V/R denotes that Current is inversely proportional to Resistance. Hence, greater the resistance lesser will be the flow of current and vice-versa.
  • A rheostat or a variable resistor is a device or a component which allows changing of resistance in a circuit keeping the voltage same.
  • In a conductor, electrons are attracted by the atoms. This is a resistive force which is lower for a good conductor but very high for an insulator. A conductor having some resistance is called a Resistor.

Ohm’s Law experiment

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