Electric Lights - Electric Lights Washington University...

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Electric Lights Washington University Electrical Engineering JEE 4350(Tuesday Session) Electrical Energy Laboratory by T. “Ryan” Mason With Artem Boyko Joe Doyle 1
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Report a.) Flicker It was observed that light at frequencies of less than 50 Hz was uncomfortable to those accustomed to 60 Hz. This observation means that TVs and PC most refresh at rates greater than 50 Hz otherwise b.) The 60W incandescent lamp i.) The inrush current was approximately equal to 4 (A) at 120V DC. 2
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ii.) = ( )= (- )=. Power Factor cos θ cos 2o 999 Comment: The - 2o phase shift resulted in a power factor of .999. 3
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iii.) Luminance (lux) V(v) I(A) Power (w) Normalized Luminance Normalized I Normalized Power 343 20 0.21 4 0.0078 0.4038 0.0615 2440 40 0.3 14 0.0558 0.5769 0.2154 8900 60 0.37 25 0.2037 0.7115 0.3846 18700 80 0.43 37 0.4279 0.8269 0.5692 26000 100 0.48 50 0.5950 0.9231 0.7692 43700 120 0.52 65 1.0000 1.0000 1.0000 iV.) Comment: The Normalized luminance, current, and power values increased in somewhat linear fashion with an increase in the voltage that ran though the 60 W Incandescent lamp. V.) Comment: The power versus the IV plot for the 60W Incandescent Lamp clearly shows a positively increasing linear plot in which the slope of the best fit line was approximately equal to one. Since the current was sinusoidal from the power equation below the slope of the plot should be equal to the power factor, and indeed it was very close to the power factor found in part two of this section. 4
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( ) P I V cos θ Vi.) V (V) R hot (Ω) T filament (K) 20 95.2381 1196.8667 40 133.3333 1580.5664 60 162.1622 1858.1022 80 186.0465 2081.5426 100 208.3333 2285.5703 120 230.7692 2487.1652 20 95.2381 1196.8667 Comment: In the plot of the filament temperature versus the resistance of the hot filament a linear relationship, it is observed that the hot film resistance of the 60W Incandescent Lamp increased as the film temperature increased. For the sample calculations see Appendix II. 5
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This document was uploaded on 12/03/2009.

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Electric Lights - Electric Lights Washington University...

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