Circuits Year 4

We discovered that plastic is a poor conductor of electricity.

When a switch is open (off), there is a gap in the circuit. Electricity cannot travel around the circuit. When a switch is closed (on), it makes the circuit complete. Electricity can travel around the circuit.

A simple switch

The light bulb goes off when the paper clip loses contact

We made a switch using tin foil.

Many metals, such as copper, iron and steel, are good electrical conductors.

We are trying to make a switch for our circuit.

Electricity will only travel around a circuit that is complete. That means it has no gaps. You can use a switch in a circuit to create a gap in a circuit. This can be used to switch it on and off.

A circuit always needs a power source, such as a battery, with wires connected to both the positive (+) and negative (-) ends. A battery is made from a collection of cells connected together.

Something is not working.

Some materials do not allow electricity to pass through them. These materials are known as electrical insulators.

Created By
Stephen Harvey

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a copyright violation, please follow the DMCA section in the Terms of Use.