A rectangular carbon block has dimensions 2.0 x 2.0 x 25 cm. What is the resistance...
A rectangular carbon block has dimensions 2.0 x 2.0 x 25 cm. What is the resistance between the square ends at 60 degrees C? The resistivity of carbon at 20 degrees C is 35 mW . m and the temperature coefficient of resistivity at 20 degrees C is -0.0005 per degree C.
Homework Answers
R = pL/A
where p = resistivity
L = length , A = area
R = 0.035*0.25 / 0.02*0.02
= 21.875 ohm
R = Ro(1+ 
T)
R = 21.875(1 + (-0.0005)(60 - 20))
R = 21.4375 ohm
so the resistance between the square ends at 60 oC is 21.4375 ohm
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