Those substances which allow electricity to pass through them easily are called conductors. They have electric charges (electrons) that are comparatively free to move inside the material. Metals, human and animal bodies and earth are conductors.When some charge is transferred to a conductor, it readily gets distributed over the entire surface of the conductor.
Most of the non-metals like glass, porcelain, plastic, nylon, wood offer high resistance to the passage of
electricity through them. They are called insulators.if some charge is put on an insulator, it stays at the same place.
This property of the materials tells you why a nylon or plastic comb gets electrified on combing dry hair or on rubbing, but a metal article like spoon does not. The charges on metal leak through our body to the
ground as both are conductors of electricity.
EARTHING = When we bring a charged body in contact with the earth, all the excess charge on the body disappears by causing a momentary current to pass to the ground through the connecting conductor (such as our body). This process of sharing the charges with the earth is called grounding or earthing. Earthing provides a safety measure for electrical circuits and appliances. A thick metal plate is buried deep into the earth
and thick wires are drawn from this plate; these are used in buildings for the purpose of earthing near the mains supply.
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