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An electrical circuit is a series of interconnected metal or plastic wires that carry electricity from one place to another. The wires are connected by a connector, which is a piece of metal, plastic, or other material that fits over the wires and helps to hold them together. The connector is connected to the power supply, which is a machine that sends electricity to the connector and then to the wires. The wires carry the electricity to the devices that need it, and the devices use the electricity to do things like turn on lights or make phone calls.