6th Science NCERT Chapter 9

Electricity is used for lighting homes, roads, offices, markets, factories, and for operating pumps to lift water, among other purposes.

An electric cell has a metal cap as the positive terminal and a metal disc as the negative terminal. The positive terminal is marked with a positive sign and the negative terminal with a negative sign. These terminals are important for the flow of electricity in devices connected to the cell.

A torch bulb consists of a filament fixed between two thicker wires inside a glass case. The filament, when connected to the cell terminals, lights up due to the passing electric current. The thick wires provide support to the filament, while the metal base and tip act as the terminals of the bulb.

An electric circuit provides a complete path for electricity to pass between the terminals of a cell and a bulb, causing the bulb to glow. However, if there is a break in the circuit path, such as a fused bulb or incorrect wiring, the bulb may not glow due to the interruption in the current flow.

To make a bulb glow, connect one end of the wire to the bulb's base and the other end to the negative terminal of the electric cell, while the bulb's tip contacts the positive terminal. This completes the circuit and allows the current to pass through the filament, making the bulb glow. If the bulb is fused or if there is a break in the filament, it will not glow even when connected correctly.