Three things are needed for an electric currentElectric current is a flow of electric charges (electrons). to flow in a circuitA collection of wires and electric components connected together in such a way that electric current can flow through them.:

Circuit diagrams

We use circuit diagrams to represent electrical circuits. This is the circuit diagram for a simple buzzer:

Simple buzzer circuit

The battery, switch and buzzer are represented by circuit symbols. You can find out more about circuit diagrams in the Power Up Under 11 area.



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