Type of Switch

1. There are many types of switches that can be found at home.
2. Their function is the same but they all look different.
3. These are examples of switches.

The Use of a Switch

1. A switch is a component of an electric circuit.
2. We use a switch to turn on or turn off a bulb.
3. A switch is used to complete or to break a circuit.
4. When the switch is on, the circuit is complete.
5. Electricity flows through the circuit. The bulb light up.
6. When the switch is off, the circuit is incomplete.
7. Electricity cannot flow through the circuit. The bulb does not light up.

4.2 Materials that Conduct Electricity

1. All metal objects conduct electricity.
2. They are called conductors.
3. For example, iron nail, paper clips and steel spoons are conductors.
4. The bulb will light up when these objects are connected in a circuit.
5. Wire are made of materials that conduct electricity.
6. This allows the electricity from the battery to flow through them to light up the bulb.
7. Non-metal objects do not conduct electricity
8. They are called non-conductors.
9. For example, plastic, rubber and wood are non-conductors.
10. The bulb will not light up when these objects are connected in a circuit.

4.1 Making a bulb brighter or dimmer

1. Electricity flows in a circuit.
2. We can use a bulb, a battery and a connecting wire to make a complete circuit.
3. We can add more batteries in a circuit to make the bulb brighter.
4. This is because more electricity flows in a circuit when more batteries are used.
5. If fewer batteries are used, less electricity flows in the circuit. This will make the bulb dimmer.
6. If more bulbs are used in a circuit, all the bulb will be dimmer.