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Electrical wiring is commonly composed of metal covered in plastic or rubber coating. Which of these materials is an insulator and which is a conductor?

User Ajspencer
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Since it conducts electricity so well, the metal would be the conductor. Lacking a capability to conduct electrical currents like the metal, materials such as plastic and rubber are more often used as insulators. In conclusion, the metal is the conductor of the electrical wiring, and the plastic/rubber coating would be the insulator.

User RussKie
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