Why are the earbud wires for an mp3 player coated with plastic?

For mechanical and electrical protection.

Explanation:

The plastic that covers the mp3 headphones has many purposes. Mainly as electrical and mechanical protection. They serve as insulation material to prevent current leakage and protect the cables from external elements that could damage it. They form in turn a protective cover of the cable that guarantees support so that when bending the cable, the conductor material that this inside does not cut.

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