A circuit is a path that electrons move on. For instance, to make a fan work electrons flow from the battery, through a wire, to the motor. Inside the motor, the wire is coiled around a magnet. The current moves in a circle and produces a magnetic field and that spins the magnet which spins the fan. The current then flows back to the battery. If you put a switch in, then you can turn the fan on and off by opening and closing the circuit. Above is the fan I made.
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