- so what are the points to be noticed in a domestic circuit ?
Answers
Domestic circuit are the electric circuit wring done in the houses and buildings.
Electricity is transferred to our homes through a pair of insulated copper or aluminium wires. This pair consists of a red colour wire (called live wire, L), and a black colour wire (called neutral wire, N). In addition to these wires, a green colour wire known as the Earth wire, E is also connected with the circuit. In India, 220 V potential is supplied through live wire, while neutral wire has ground potential of zero volts.
Domestic wiring in a house requires a number of electric devices to run simultaneously. Thus, they should be independent of each other i.e. the working of one device should not depend on the working of another device.
For example, the working of a fan should not be affected when a bulb in the room gets fused. In parallel circuits, if one appliance stops working, all other appliances work as usual. Hence, parallel circuiting is used in house wiring or in lights used to decorate buildings on occasions. This is done to ensure that if one bulb fuses, the others remain functioning
1. Household electric supply consists of 3 types of wire. Live wire (red insulation cover), neutral wire (black insulation cover) and earth wire (green insulation cover)
2. The potential difference between neutral and live wire is 220V.
3. In household circuit system, two type of circuit are used. One of 15 A for appliances with higher power ratings and the other of 5 A ratings for bulbs etc.
4. In domestic circuit, different appliances are connected in parallel combination. This ensures that if one appliance is switched ‘on’ or ‘off’, the others are not affected.
5. The earth wire is used as a safety measure, especially for those appliances that have a metallic body.
Working of earth wire
The metallic body is connected to the earth wire, which provides a low resistance-conducting path for the current. It ensures that any leakage of current to the metallic body of the appliance will flow to the earth only and the user may not get a severe shock.
