From: utzoo!decvax!harpo!ihnp4!ihuxr!lew Newsgroups: net.physics Title: Re: Temperature Coeffecient of Resistance Article-I.D.: ihuxr.298 Posted: Fri Jan 21 17:39:00 1983 Received: Sat Jan 22 05:31:35 1983 Reply-To: lew@ihuxr.UUCP (Lew Mammel, Jr.) When I was a TA for freshman physics at Lehigh U., I worked out the I-V characteristic for a light bulb based on the assumptions R=T and P = I*V = T^4. This gives I*V = ((V/I)^4 or I^5 = V^3. It was a student assignment to measure this characteristic, so I had lots of data available. I plotted log I vs. log V and found the slope to be .586, which compares favorably to the predicted value of .6 -- and the line was nice and straight too. This indirectly verifies the validity of the R=T relation over a temperature range of (T1/T0) = 2.5 , corresponding to a voltage range of from 1 to 10 volts (use V^2=T^5). Lew Mammel, Jr. ihuxr!lew