DIY cross fire

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Crossfire is an interesting electric conduction experiment which demonstrates sound, light and electricity.
When the ship eye bolt on the plastic rod contacts the Aluminium lead, the power source, buzzer and LED will be conducted. The LED shines and the buzzer make sounds.
When the ship eye bolt on the plastic rod doesn’t contact the Aluminium lead, there will be an open circuit. The buzzer and LED don’t work.

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