5CL Lab 5 Assignment Template - S23v2

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University of California, Los Angeles *

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Electrical Engineering

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Feb 20, 2024

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Activity 1 - Standard Resistor: Insert a picture of the resistance measurement you took with the multimeter (showing both the resistor and the resistance value on the multimeter). Insert a picture of the circuit you used to measure the voltage and current on your resistor. Include the two multimeters simultaneously measuring voltage and current in this picture. 2

A ctivity 1 - Standard Resistor: Plot your 6 Current (y-axis) vs. Voltage (x-axis) data points. Calculate resistance for each of these 6 points and plot Resistance vs. Voltage. Does the resistance depend on voltage? Based on your answer, is this resistor Ohmic or non-Ohmic? Calculate your resistance from this data (see lab manual) and compare to the direct resistance measurement. Are the two measurements the same? Do they agree with the nominal 100Ω rating of the resistor? According to Ohm’s law resistance does depend on voltage as the equation I=V/R converted to solve for resistance is R=V/I. Thus demonstrating R does depend on the voltage. The resistor is Ohmic as we can see a linear relationship in the current vs voltage graph. The final resistance measurement is 10.013/ 0.099=101.14. The two value are different as our direct resistance measurement was 99 Ω. They both do not agree with the nominal 100Ω rating of the resistor as our direct measurement was below and our calculated measurement was above the 100Ω rating of the resistor. 3 Voltage Current Resistance 0.013 0.001 13 0.94 0.009 104.44 1.43 0.014 102.14 1.92 0.019 101.05 2.42 0.023 105.22 3.29 0.033 99.64

Activity 2 - Light Bulb: Plot Current vs Voltage for your 10 data points. Calculate resistance for each measurement and plot Resistance vs. Voltage. Is the light bulb Ohmic? Explain your answer. It is not Ohmic because there is a nonlinear relationship between Current and Voltage seen in our first plot. 4 Voltage Current Resistance 0.010 0.005 2 0.183 0.066 2.772727273 0.415 .196 2.117346939 0.992 .271 3.660516605 1.450 .327 4.434250765 1.609 .346 4.650289017 1.988 .386 5.150259067 2.383 .427 5.580796253 2.887 .473 6.10359408 3.105 .509 6.100196464

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Activity 3 - Diode: Plot Current vs Voltage for your 10 data points. Calculate resistance for each measurement and plot Resistance vs. Voltage. Is the diode Ohmic? Explain your answer. The diode is not ohmic because there is not a linear relationship between current and voltage. 5 Voltage Current Resistance 0.685 0.001 685 0.697 0.002 348.5 0.714 0.005 142.8 0.733 0.009 81.44444444 0.742 0.013 57.07692308 0.760 0.022 34.54545455 0.772 0.032 24.125 0.778 0.038 20.47368421 0.786 0.048 16.375 0.788 0.053 14.86792453

Activity 4 - LED+Resistor: Plot Current vs Voltage for your 10 data points. Perform a linear fit on the largest 4 voltage points in your Current vs Voltage plot and include this fit line on the plot. What is the slope of this line and what does it tell you about the resistance of the LED+resistor? Is the LED Ohmic? Explain your answer. 6 Voltage(V) Current (mA) Resistance( Ohm) 1.945 0.000 undefined 2.005 0.86 2.331395349 2.041 1.48 1.379054054 2.096 2.52 0.8317460317 2.169 4.02 0.5395522388 2.257 5.95 0.3793277311 2.381 8.79 0.2708759954 2.503 11.74 0.2132027257 2.661 15.62 0.1703585147 2.831 19.91 0.1421898543 The slope is 24.7. The slope of the line tells us that the resistance of the LED+resistor is not constant. The LED is non ohmic as the line of best fit for the last four lines does not also fit the first couple data points.