Make the Bulb Glow

# Objective

Make a bulb glow with the help of a few cells and a few pieces of wire.

# Theory

Have you wondered how we get electricity? When we observe our surrounding bulbs, fans, and electrical appliances are working by electricity, We get electricity from the power station. Can you demonstrate the production of electricity? A simple source of electricity is known as the electric cell.

The metal tip is the positive terminal of the cell. The metal base is the negative terminal of the cell.

We need work to bring charges from one location to another location. Cell maintains a potential difference.

The universe is made up of atoms. An atom consists of tiny particles like electrons, protons and neutrons.  The flow of electrons from the negative terminal to the positive terminal is known as electricity. We want to replace the cell when the chemicals inside the cells are used up.

Bulb

Electric bulbs help to see in nights. The glass case is attached to metalic base. The thin wire which emits light is known as filament. It is made up of the element tungsten. Filament is attached to two thicker wires. One thicker is attached to metal tip at the centre of the base. Another thicker wire is attached to a metal case at the base of the bulb. Two terminals of the bulb are base of the bulb metal tip of the base.

When the light bulb fuses, the thin coil inside has snapped, and therefore, electricity cannot flow.

Make the bulb glow

You can make the bulb glow by connecting two terminals of battery to two terminals of bulb. An electric circuit will always be complete. Electric circuits contain a source of energy and some components which use that electricity.

The bulb will not light up if the light bulb has fused. When the light bulb fused, the filament broke. Electricity does not conduct through open circuits. The direction of the current is from the positive terminal to the negative terminal.

An electric switch is a simple device that breaks or completes the circuit. You can make the switch in your home by connecting the safety pin to drawing pins, as shown in Fig. Later, you can connect the edges of the switch to the battery or bulb.

# Learning Outcomes

• Students can demonstrate electric circuits.
• Students can understand the basic principles of electric circuits.
• Students understand the components of electric circuits.