Question

Which wire in a power circuit is connected to the metallic body of the appliance ?

Answer 1

Hint: The term earthing, which is also denoted as grounding, is based on research that demonstrates that connecting to Earth's electrical energy encourages physical welfare. The use of Earthing or grounding denotes a physical connection between the electrical currents of the human body with that of Earth.

Complete answer:
Grounding is used to keep safe us from an electric charge or shock. It is used to safeguard the circuit and the users of the electrical appliance by using out a path (that is a protective conductor) for a short circuit current to flow to into the earth. It also create a protective device; that is either can be a circuit-breaker or fuse, to cut off the electric current of the circuit that has the reproach.

The earth wire colour is use by the colour green or yellow stripes, that is in accordance with the IEC that is the International Electrical Commission's regulations. It has the specific safety function of connecting the metal casing of the appliance that is being used with the ground of the earth.

Hence, the metallic body of any appliance is connected to the green wire, which is the earthed wire, of the cable in an electrical circuit.

Note: If a home or an industry or a power line is not earthed, anyone could get electrocuted. Without a ground connection, the safety switches of any kind will not work and an electrical circuit fault could cause a home or a factory or a power line to become 'live' as the current does not flow to earth.