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Resistance and resistivity

  • Thread starter frozen7
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  • #1
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A resistor is to have a constant resistance of 30(ohm), independent of temperature. For this, an aluminium resistor with resistance R1 at 0(celcius) is used in series with a carbon resistor with resistance R2 at 0(celcius). Evaluate R1 and R2, given that [tex]\alpha 1[/tex] is 3.9 x 10^-3 for aluminium and [tex]\alpha 2[/tex] is -0.5 x 10^-3 for carbon.

Can anyone give me some clues to solve this question? Thanks in advance.
 

Answers and Replies

  • #2
Curious3141
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Start with the definition of alpha.
 
  • #3
lightgrav
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Resistances in series ...
there's a way to represent these with a single equivalent resistance ...
 

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