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Answers
Explanation:
Electrical resistance is opposition to the flow of current in an electric circuit: resistance converts electrical energy to thermal energy, and in this regard is similar to mechanical friction. Resistances are said to dissipate electrical energy as heat.
The resistance of a conductor is directly proportional to its length (L) as R ∝ L. Thus doubling its length will double its resistance, while halving its length would halve its resistance. Also the resistance of a conductor is inversely proportional to its cross-sectional area (A) as R ∝ 1/A.
Resistance of a conductor is inversally proportional to area of cross section that means if the area of cross section increases resistance decreases.
With increasing temperature, the resistance of the wire increases as collisions within the wire increase and "slow" the flow of current. ... Since conductors typically display an increased resistivity with temperature increase, they have a positive temperature coefficient.
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