EC1 Lab Report VI 1 I 0 5mA v 0 001V VR I RDMM Resistor A 2 82 20 147 8 Resistor B 5 86 28 214 9 Resistor C 6 25 17 384 Resistor D 10 84 11 5 988 Resistor A 141 3 525 Resistor B 209 29 3 737 Resistor C 367 65 10 81 3 Resistor D 942 61 40 98 3 The directly measured value of R using the DMM agrees with the resistance determined from measurements of V and I Therefore the discrepancy is 37 458 which is significant VI 2 V I pairs for a resistor using DC power supply 1 2 3 4 5 V volts 0 753 1 436 2 129 2 863 3 616 I mA 5 10 15 20 25 Graph of V vs I Voltage vs Current f x 0 14 x 0 01 4 3 5 3 2 5 2 1 5 1 0 5 0 v e g a t l o V 0 5 10 15 20 25 30 Current mA Using excel we calculated the slope and uncertainty in slope as follows Slope Slope Uncertainty 0 1431 0 00178449 R R 143 1 1 78 The resistor is ohmic as there is a linear relationship between the voltage and current VI 3 1 2 3 4 5 6 7 8 9 10 V volts 0 20 0 40 0 60 0 65 0 70 0 71 0 72 0 73 0 74 0 75 I mA 0 0 2 5 15 17 21 27 31 40 Graph of V vs I Voltage vs Current 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 v e g a t l o V VI 4 VI 5 V I RDMM Rseries 1 4 12 167 3 Rparallel 1 39 19 64 20 0 5 10 15 30 35 40 45 20 25 Current mA The diode is not an ohmic conductor Plotting the voltage and current results in a non linear relationship where the slope of the graph is not constant Using the data from VI 4 5 the two calculated values for the series and parallel network of resistors are similar because they fall within each other s uncertainty ranges
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