Materials that do not allow electric charges to flow through them are called .

Mercury coated on a zinc plate prevents the impurities from coming into contact with acid and prevents _____.

A _____ wire is a safety device that prevents the excess flow of current through an appliance.

An electric heater works on the basis of _____ the electric current.

A neutral body means a body with no charged particles on it.

The charged particle in an atom that contributes positive charge is an 'electron'.

Substances that allow charges to pass through them are called conductors.