Transcription of Temperature coefficient of resistivity
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Temperature coefficient of resistivity
Temperature coefficient of resistivity )]TT(1[oo + = )]TT(1[RRoo += T0 = reference Temperature = Temperature coefficient of resistivity , units of( C)-1 For Ag, Cu, Au, Al, W, Fe, Pt, Pb: values of are ~3-5 10-3 ( C)-1 Tslope = )]TT(1[RRoo +=Example: A platinum resistance thermometer uses thechange in R to measure Temperature . Suppose R0 = 50 at T0=20 C. for Pt is 10-3 ( C)-1 in this Temperature is R when T = C?R = 50 [1 + 10-3 ( C)-1 ( C)] = Temperature coefficient of resistivityExample: A platinum resistance thermometer has aresistance R0 = at T0=20 C. for Pt is 10-3( C)-1. The thermometer is immersed in a vesselcontaining melting tin, at which point R increases . What is the melting point of tin?
Power Transmission Transmitting electrical power is done much more efficiently at higher voltages due to the desire to minimize (I2R) losses. Consider power transmission to a small community which is 100 mi from the power plant and which consumes power at a rate of 10 MW. In other words, the generating station needs to supply whatever power it ...
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