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Which one of the following does not affect resistance of a wire 1 length 2 dielectric contstant 3 temperature 4 cross-sectional area?
Wiki User
∙ 16y ago
Answer - None of the above.
1. Resistance increases in direct proportion to an increase in length.
2. Dielectric constant is the tricky one as the answer may depend on your application. Dieletric constants are usually associated with insulators, not conductors.
For fixed voltage/direct current, as long as the dielectric's voltage specifications aren't exceeded, the insulator remains intact. Going beyond that voltage results in current flow (short) and a significant reduction in resistance. So in essence, changing the dielectric constant will alter the resistive properties of your conductor/nonconductor.
For situations dealing with alternating currents, capacitance becomes an issue - as there is a current flow as the electric field fluctuates, but just as before - the dielectric constant is not a factor in a component's resistance... until its voltage ratings are exceeded.
3. An increase in temperature usually results in a decrease in resistance.
4. An increase in cross sectional area results in a decrease in resistance.
Note: If "none of the above" is not an option here, then I would have to select #2 as being the answer, with some qualification as noted.
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∙ 16y ago
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