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: A '''circuit''' starts and ends at the source.
To practice building a circuit you can use a circuit simulatorby clicking on the picture below.
{| class="wikitable"
|[[File:SeriesCircuit1Cell1BulbPhetCircuit.png|centre|300px|link=https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html]]
|}