Lab Report 10

Lab Report 10 - EXPERIMENT EC4 WHEATSTONE BRIDGE VI - 1 In...

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VI - 1 R 3 = 50 Ω σL = 0.25 cm # L 1 (cm) L 2 (cm) σL (cm) Rx (Ω) Rm (Ω) σRx (Ω) ΔRx (Ω) 1 21.70 78.30 0.25 180.41 174.51 2.65 5.90 2 35.50 64.50 0.25 90.85 87.39 0.99 3.46 3 48.30 51.70 0.25 53.52 51.59 0.54 1.93 4 67.90 32.10 0.25 23.64 23.02 0.27 0.62 For all the calculated resistances, the value of resistance calculated using the Wheatstone bridge is significantly different to the measured value of the resistance. And it lies well outside the error range. How ever, a number of other possibilities do exist. These may include, the small voltages which may occur at junctions of two dissimilar metals in the experiment, the existence of resistance in the connecting wires, the possible change in resistance in part of the apparatus due to the heat generated by the current and non-uniformity of the resistance wire. As the resistance boxes are usually very precise, it is unlikely an error would be caused as a result of them Errors in obtaining the measurement could also not be ruled out, especially the insufficient
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This lab report was uploaded on 04/08/2008 for the course PHY 158 taught by Professor Staff during the Spring '08 term at SUNY Buffalo.

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Lab Report 10 - EXPERIMENT EC4 WHEATSTONE BRIDGE VI - 1 In...

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