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Making a ‘cracked carbon’ volume control

How to make a ‘cracked carbon’ volume control

This experiment uses pencil lead as it contains carbon and carbon is a good conductor of electricity. A 9V battery, two wires and a buzzer (9V) are some of the additonal materials required to help construct the circuit.

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Rights: Information Matters Ltd
Published: 25 July 2022Size: 383.15 KB
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