Question

Summary of chapter electric current and its effect class 7
Write important points that are in chapter
The summary should be of atleast 8 lines
​

Answer 1

Answer:

1. For the production of light, the heating effect of electric current is utilised in the electric bulbs.
2. For the working of electrical heating appliances such as water heater, electric room heater, electric iron, etc., the heating effect of electric current is utilised.
3. The heating effect of electric current is utilised in a safety device called ‘electric fuse’.
4. If the magnitude of current passed through a given wire is greater, then the heat produced in it will also be greater.
5. e.g. if a normal amount of current flows through the copper wires of household electric wiring, then the wires do not become much hot but if a large current flows in the same wiring accidentally, then the wires become extremely hot and a fire may be started.
6. An electric bulb is basically used for producing light but it also releases the heat which is not desirable because a major part of the electricity consumed by the filament of a bulb is converted into heat and results in the wastage of electricity.
7. A safety device which works on the heating effect of current and prevents electric fires or damage to electrical appliances due to excessive flow of current is known as the fuse. This safety device consists of a short length of a thin wire of tin plated copper having a low melting point and this wire has a much greater resistance than the rest of the electric wiring in the house.
8. It is a situation when too many electrical appliances are connected to a single socket, they draw an extremely large amount of current from the household circuit. The flow of large current due to overloading may heat the copper wires of household wiring to a very high temperature and fire may be started.

Pls mark my answer as the brainliest!!!