Class 10 Physics Electricity Heating effect of Current

Heating effect of Current

When a voltage source like a battery generates current for a circuit, most of the energy is used up in maintaining the current inside the circuit. However, a portion of the energy is dissipated in the form of heat. In a circuit containing only battery and resistance, the entire energy is dissipated in the form of heat. This is heating effect of current.

Power = Work Done / Time TakenorP = W / t

Since, Potential Difference = Work Done / ChargeorV = W / Q

P = VQ / tor P = VI, where I (current) = Charge / Time Taken

Energy supplied by power source to a circuit in time t is, H = P x t = VIt

Or from Ohm’s law, H = I2Rt

This is known as Joule’s law of heating. It states that heat produces in a circuit is directly proportional to the square of current flowing, resistance for current and time for which current flows.

Disadvantages of heating effect

  • Loss of energy in the unwanted heat.
  • Wear and tear of components.

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