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The particles that carry charge around a circuit are electrons. In some semiconductors, missing electrons in a crystalline structure (of silicon or germanium), caused by adding special impurities, form spaces called "holes" where there is a missing electron. These "holes" can also travel but, in the end, it is electrons that move in the opposite direction to fill those holes that carry the current.

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If there is a full circuit, it will send current around it.


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An electric current flowed around the circuit.


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You can start an electric circuit by closing the circuit, typically by turning a switch on. You can stop an electric circuit by opening the circuit, usually by turning a switch off or disconnecting a wire.


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