how the resistance of wire changes with its cross section area
Answers
Resistance is inversely proportional to the cross section area of a wire... means thicker the wire is lesser is the resistance.
Answer:
The resistance of a conductor is inversely proportional to its area of cross section.
A dummy approach:
The concept of current flow in a conductor is analogous to liquid flow in a pipe. Consider a narrow pipe and a thick pipe. The amount of liquid flowing per unit time will certainly be higher in the thicker pipe compared to the narrower one provided that the velocity remains same. The same is true for current flow. As the amount of current flowing at constant voltage increases with increase in cross sectional area, resistance decreases.
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