Luke tested several materials in a circuit. The bulb lit up when he used a copper wire, but not when he used a plastic string. This is because plastic is an __________.
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Worked Solution
Step 1: Materials that allow electricity to flow are conductors.
Step 2: Materials that do not allow electricity to flow are insulators.
Step 3: Since the bulb did not light up with plastic, plastic is an insulator.
Correct answer: electrical insulator
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