Question

1.) What are advantage of electricity ?

2.) What is a electric cell ?

3.) What is open circuit and closed circuit ?

4.) What is a conduction tester ?

5.) Name a insulator.

Answer 1

Answer:

1.) Electricity is used for lighting our houses, offices, roads etc. To operate pumps which in turn have a lot of applications. Electricity is used for the working of electrical appliances like refrigerator, fans etc .

2.) Electric cell is a device used to produce electricity from the chemicals stored

inside it. Electric cells are used in torches, clocks, watches, transistor radios, calculators, cameras etc. An electric cell has a metal cap at one end and a metal disc at the other end. The metal cap is the positive terminal (+) and the metal disc is the negative

terminal (-). The space inside the electric cell is filled with chemicals.

3.) Open circuit: If there is any gap in the path of a circuit, the bulb does not light up. Such a circuit is called an open circuit.

Closed circuit: The bulb lights up only when a bulb and wire form a complete path, which starts at one terminal of electric cell and ends at the other terminal. Such a circuit is called a closed circuit .

4.) A conduction tester is a device used to test whether a material is a conductor or

insulator of electric current. A simple conduction tester has an electric cell connected

to a bulb by a wire. If the two free ends of the wires are brought in contact with a material and the

bulb glows then the material is a conductor of electric current. If the bulb does not

glow then the material is an insulator of electric current.

5.) Rubber , plastic , wood ,cloth are insulators