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March 1, 2015

March 1, 2015

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

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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