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 Taken**orP = W / t*

Since, *Potential Difference = Work Done / Charge**orV = W / Q*

*P = VQ / t*or *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 = I ^{2}Rt*

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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