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: A '''circuit''' needs to be complete otherwise electricity will not flow through it. Any break in the '''circuit''' will stop the electricity from flowing.
: A '''circuit''' starts and ends at the source.
{| class="wikitable"
|-
|[[File:CompleteCircuit.png|center|200px]]
|[[File:IncompleteCircuit.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |A circuit must be a complete loop without any breaks or it will not work.
| style="height:20px; width:200px; text-align:center;" |The break in this circuit stops it from working.
|}
To practice building a circuit you can use a circuit simulator by clicking on the picture below.