Resistor and Diode Characteristic

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School

Thomas Edison State College *

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Course

306

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Electrical Engineering

Date

Jan 9, 2024

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docx

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Uploaded by kevinalandro

Kevin Austin ELT-306 Lab 2: Resistor and Diode Characteristic Plot current vs. voltage for a 1 kΩ resistor We will first use Multisim to collect and record the data points to create a graph. Then we will use physical components to generate an additional data point and see if it is consistent with the plot. Create the circuit given below in Multisim, and use it to generate data to fill in the provided table. Set the required voltage using the Value tab of properties of V1, run the simulation, record current value, stop the simulation, change voltage value, and repeat until you have got all the required data. Voltage (V) 10 8 6 4 2 0 -2 -4 -6 -8 -10 Current (mA) 10 8 6 4 2 0 -2 -4 -6 -8 -10

Calculate the slope of this straight line: ΔI/ΔV= 1 This equals the conductance G From this value of G, calculate R= 1/G = 1 Please insert, here, simulation screenshots for two different data points that you entered in the results table for part A: Now you will measure the current across the 1K resistor using the 9V battery to perform a real-world measurement and to verify the results of simulation. ● Use your graph to read the expected value of current at 9V: 9.0 A ● Connect the battery, multimeter, and resistor on the breadboard and read the value of current shown on the multimeter: 8.98 A

It should be close to the value read from the graph but not exactly the same. This is because the resistance and battery voltage are not exactly what we have assumed. ● Use the multimeter to measure the battery voltage when the resistor is connected across the battery terminals, and record it here: 8.89 V ● Remove the resistor and measure its resistance using the multimeter: 975 Ω ● Use Ohm's law and the two values above to calculate the current: I = V R = 8.89 V 975 Ω = 9.12 mA

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Plot current vs. voltage for a diode We will first use Multisim to collect and record the data points to create the plots. Then we will use physical components to generate an additional data point and see if it is consistent with the plot. Create the circuit given below in Multisim, and use it to generate data to fill in the provided table. Supply Voltage (V) Current (mA) Diode Voltage (mV)

0.2 0.001 200 0.3 0.001 299.998 0.4 0.001 399.886 0.5 0.020 554.89 0.6 0.205 554.89 0.7 0.542 580.605 0.8 0.930 595.185 0.9 1.34 602.253 1 1.759 612.97 1.5 3.992 637.166 2 6.126 652.228 3 10.575 673.466 4 15.047 689.741 6 24.017 716.189 8 33.005 738.792 10 42.001 759.422 15 64.516 806.544 20 87.044 850.335 30 132.122 933.253 40 177.214 1013 -3 -0.001 -3000 -6 -0.001 -6000 -9 -0.001 -9000

Current and diode voltage values for supply voltage 0.2V to 2V Current and diode voltage values for supply voltage 2V to 40V Simulation screenshots for two different data points that you entered in the results table for part B.

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Create a circuit similar to the given simulation circuit, on the breadboard. Your kit has a 220 ohms resistor and 1N914 diodes. Since you are required to have only one multimeter, use it to measure the current first, and record the value: 36.41 mA

Now disconnect the multimeter and use a jumper to connect the two points that were being used for the multimeter. Next, use the multimeter to measure the voltage across the diode, and record the value: 788 mV