Why is it advised to clean the ends of connecting wires before connecting them?

If dirt and grease were good conductors of electrical current, then we could make wire out of dirt and grease instead of expensive copper. Sadly, they're not. So a coating of dirt and grease on the wire can have a substantial impact on the connection, and can even block the flow of current across the connection completely. Moreover, in the case where the ends of the wires are to be soldered, solder does not adhere to dirty wire.

Answered by AL2006 | 2024-06-10

To avoid poor contact and consequently the increase of the electrical resistance at the junction.

Answered by Ryan2 | 2024-06-10

Cleaning the ends of connecting wires improves conductivity, creates a better mechanical bond, prevents corrosion, and enhances safety. Dirty surfaces can act as insulators, reduce the efficacy of soldering, and risk overheating and electrical failures. Thus, regular cleaning is a good practice for reliable electrical connections.
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Answered by AL2006 | 2025-04-10