Grade 12th passElectric Current
how does internal resistance vary with temperature and area of crossection
how does internal resistance vary with temperature and area of crossection
1 Answer
Karthik Kumar
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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