Magnetic Effects of Electric Current | Class 10 Science Notes

12.4 DOMESTIC ELECTRIC CIRCUITS

Electric power is supplied to homes through a main supply called mains, which may be overhead wires or underground cables. The supply consists of three wires: live wire (red insulation), neutral wire (black insulation), and earth wire (green insulation).

The potential difference between the live and neutral wires is 220 V in India. At the meter board, these wires pass through an electricity meter and a main fuse before connecting to the house circuits. Separate circuits with different current ratings (e.g., 15 A for high power appliances and 5 A for lights and fans) supply electricity to various appliances.

Appliances are connected in parallel to ensure each receives the same potential difference. Each appliance has a separate switch to control current flow.

The earth wire is connected to a metal plate deep in the earth and provides a low-resistance path for leakage currents, preventing electric shocks by keeping the metallic body of appliances at earth potential.

Electric fuses protect circuits from overloading and short-circuiting by melting and breaking the circuit when current exceeds safe limits. Overloading can occur when too many appliances are connected to a single socket or due to insulation damage causing short circuits.

Safety measures such as proper wiring, use of fuses, and earth wires are essential to prevent electrical hazards in homes.

📊 Diagram: Figure 12.15 A schematic diagram of one of the common domestic circuits

🔗 Connection: Summarizes the chapter and prepares for exercises.

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