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Electricity works by traveling though a circuit, usually through wires. Each circuit has three components - the source that generates the power, the "user" or object receiving the charge (like a drill or light) and the transmission lines that carry the current from the source to the user. This circuit must remain unbroken. It can be 'closed' meaning the electricity is just looping, or it can be "open" where it goes in and out of objects (like the light or drill).
