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LinearMan
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Homework Statement
Prove a rule for adding of Thermal resistances
for: A)R1 and R2 in Series
B)R1 and R2 in Parallel
Homework Equations
The Attempt at a Solution
According to the book the result should be :
A) R = R1 + R2
B) 1/R = 1/R1 + 1/R2
So i thought we can get some ideas from the theory of Electrical resistance because these formulas are similar for example here: http://www.grc.nasa.gov/WWW/k-12/airplane/ohmrser.html .
However, I don't know how to start (in Thermodynamics there is no Electric current etc., so we can hardly use Ohm´s formula like in previous case).
Thanks for help
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