Question

Describe domestic electric circuit with the help of a diagram.Answer the given question in pointwise.

Answer 1

A common house has a very simple electric system. Which consist of three types of wire:
•Earthing (Green wire)
•Live (Red wire)
•Neutral (Black Wire)
Electricity is generated in power stations from there it reaches our houses from very thick wires over electric poles. And then it reaches in every corner of our house. The circuit which show how it reaches in every corner is shown in the picture:

$\textbf{Live wire and neutral wire}$: As the name suggest these are the main wires that is, they are the positive terminal and negative terminal of the circuit (respectively). The potential difference between these two wires is 220 V and the frequency of the alternating current provided by these wires is 50 Hertz.
These wires from electric boards fuse passes through the electricity meter of the house, then they are connected to the main switch of the house. From there all the appliances are connected in parallel to the main switch. The reason behind parallel connection is to provide same voltage to each plug/device.

$\textbf{Earthing Wire}$: It is the safety measure to prevent shocks and device damage. Devices like electric motor, heater, iron and refrigerator use very high amount of current.
So sometimes, there is a leak of electricity/current from these devices, this may cause very harmful damage to anyone.
So, to prevent such type of situation there is earthing wire, which basically absorb all the leaked current from the device and dump it to the earth. As, earthing wire is connected between metallic plates of device and earth. Earth then absorb all the leaked current and prevent us from any danger.

Answer 2

Answer:

Below is the diagram of domestic electric circuit. From the power station, electricity is supplied to our houses at 220V. The electric line is connected to the meter-box in a house through a fuse of high rating (company fuse). In the main switchboard, fuses are kept for different circuits as per requirement.

Electricity is generated at the power station. It is brought to our homes by two thick copper wires or aluminium wires fixed over tall electric poles (or by underground cables). The electricity from the mains is supplied to the houses using a three-core wiring.