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how does internal resistance vary with temperature and area of crossection

how does internal resistance vary with temperature and area  of crossection

Grade:12th pass

1 Answers

Karthik Kumar
100 Points
5 years ago
we know that Resistance(R)=resistivity*(l/a)
where l =length of the resistor
a=area of cross section
 R is inversely propotiona to cross sectional area
as area of cross section increases resistance decreases
if decreases then resistances increases.
and also when temperature increases 
metals  resistance increases because they have positive temperature coefficient.
semiconductors resistance decreases when temperaure increase because they have negaive temperature coefficient

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