Circuits

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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

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