Latha saw an Electrical line man on the electrical pole, he is rubbing electric wire with a sand paper.
She asked him ''why are you rubbing the wire, with sandpaper?'' What answer could be expected you from the line man?

Silver is the best conductor of electricity.Can you say why silver electric wires are no made?

There are two electric poles, one is with hollow structure and other with a solid structure. They are made from the same and equal amount of material. Which electric pole do you perfer? Why.

Mohan is a student of class 6 . One day , his science teacher taught him electricity . After that, he had many doubts about the electical appliances and measuring devices that are used in his home . He observed that a wire from an electric pole is connected to a joule meter. A , fixed to the walll in the veranda, and from there to a main switch , and then to the main fuse, a refrigerator, a fan and a bulb are connected in parallel. Find out the appliance that consumes the least electric power among them.

(i) What is the function of earth wire in electrical instruments? (ii) Explain what is short circuiting an electric supply. (iii) What is the usual current rating of the fuse wire in the line to feed?

(i) What is the function of earth wire in electrical instruments? (ii) Explain what is short circuiting an electric supply. (iii) What is the usual current rating of the fuse wire in the line to feed: (a) Lights and fans? (b) Appliances of 2kW or more power?