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April 16, 2014

Homework Help: Plz help Physics-bobpursley

Posted by Charles on Tuesday, April 17, 2007 at 8:44am.

Bob, please confirm if I got this right and if not, please help to solve

1)A wire has a resistance of 10 ohm at 20 deg celsius and 13.1 ohm at 100 deg celsius. Obtain a value for its temperature coefficient of resistance.
ans I got is this=
using Rt = Ro (1 + alpha(T-To))
13.1=10(1 + alpha(100-20))
13.1 = 10(1+80 alpha)
alpha = 3.1/800 = 0.003875



I didn't do the calc, but you did the right algebra.

... and don't foget the units.

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