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Electricity flows where there is a potential difference and some means of discharging that difference. A circuit is the loop of the thing causing the potential difference and the components that allow it to discharge. What seems to be confusing you is that the power source isn't always included in a circuit diagram.

If you think in terms of a lighting circuit, the light comes on when the switch is closed. The part of the circuit inside your house only has the mains supply, some power switchgear, the light switch and the light. However, the circuit continues back through the supply cables to the generating station. Break the circuit at any point, in your house, under the street or a wire in the generator, and out goes the light.

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12y ago
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Q: What is it called when a circuit that has only one path?
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