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Electrical resistance in a wire depends on the wire's __________.I. lengthII. diameterIII. resistivityGroup of answer choicesIIIAll of the aboveIIINone of the above

User Leninzprahy
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1 Answer

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Electrical resistance is directly proportional to the length of the wire.


R\propto length

Electrical resistance is inversely proportional to the area of the cross section.


\begin{gathered} \text{R }\propto\text{ Ar}ea \\ R\propto\pi(radius)^2 \\ R\propto diameter \end{gathered}

Electrical resistance is directly proportional to the resistivity


R\propto resistivity

Thus, the correct option is all of the above.

User Bill Menees
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