Chapter 12: Magnetic Effects of Electric Current

The safety measures commonly used in electric circuits are as follows:

1. Fuse

Each circuit should be connected to a fuse because a fuse prevents the flow of excessive current through the circuit. When the current in the circuit exceeds the maximum limit of the fuse element, the fuse melts to stop the flow of current protecting the appliance connected to the circuit.

1. Earthing

Earthing protects the user from electric shocks. Any leakage of current in an appliance is transferred to the ground by earthing, and the people using the appliance are prevented from getting electrocuted.

The current drawn by the electric oven can be calculated using the formula

P = V × I

I = P/V

Substituting the values, we get

I = 2000 W/220 V = 9.09 A

The current drawn by the electric oven is 9.09 A which exceeds the safe limit of the circuit. This causes the fuse to melt and break the circuit.

A few of the precautions to be taken to avoid the overloading of domestic electric circuits are as follows:

• Connecting too many devices to a single socket should be avoided
• Using too many appliances at the same time should be avoided
• Faulty appliances should not be connected to the circuit