- #1
piratebill
- 4
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Hi
I was wondering if anyone could help. My teacher isn't very good at explaining things and he's given us a question without going through the reasoning behind the equation.
Aluminium wire has a resistance of .250Ω at 0°C. Give that the temperature coefficient of resistivity at 0°C for aluminium is 0.004 find the resistance of the wire at 200°C
My answer is Rt = .250 x (1+.004x200) = 0.45Ω
What I don't get however is why isn't it just .250Ω + (0.004 x 200) which would equal 1.05Ω
I thought the temperature coefficient was how much the resistance increases per increased degree, which you then add to the original resistance.
If anyone could help explain ild be very grateful :)
I was wondering if anyone could help. My teacher isn't very good at explaining things and he's given us a question without going through the reasoning behind the equation.
Aluminium wire has a resistance of .250Ω at 0°C. Give that the temperature coefficient of resistivity at 0°C for aluminium is 0.004 find the resistance of the wire at 200°C
My answer is Rt = .250 x (1+.004x200) = 0.45Ω
What I don't get however is why isn't it just .250Ω + (0.004 x 200) which would equal 1.05Ω
I thought the temperature coefficient was how much the resistance increases per increased degree, which you then add to the original resistance.
If anyone could help explain ild be very grateful :)