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You actually only need two things to make a circuit. One is a power source, such as a batter, and the other is a conductive metal, e.g. copper wire. All you need to do is touch one end of the metal to one pole of the source, and the other end of the metal to the other pole, then vioala! You have a circuit.

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Q: What 4 things do you need to make a circuit?
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