Question

how do impurities affect electrical conductivity?

Answer 1

In most metals, the existence of impurities restricts the flow of electrons. Compared to pure metals, then, elements which are added as alloying agents could be considered “impurities”. So alloys tend to offer less electrical conductivity than pure metal.

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Answer 2

in most metals the existence of impurities restricts the flow of electrons compared to pure metals then elements which are added as alloying agents could be considered impurities so alloys stand to offer less electric conductivity than pure metal