Lab 2 - Harsh

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School

Algonquin College *

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Course

9104

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Electrical Engineering

Date

Apr 3, 2024

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docx

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Uploaded by GrandRockGazelle46

ELN9104 Lab 2 – Measuring Resistance and Voltage Purpose: The purpose of this lab is to learn how to use a digital multimeter (DMM) to measure resistance and voltage. Materials:  5 random resistors  3 resistors with a red multiplier band  Breadboard  Banana cables  Alligator clips  DMM  DC power supply Procedure: 1. Choose 5 random resistors from your kit. 2. Using the standard resistor colour code chart shown in image 1, identify the value of each of your 5 resistors and fill out Table 1. Image 1 1 3. Using the DMM, measure the actual value of the resistor and update Table 1. 4. Calculate the % difference between the colour code values and the measured values, using the following formula: % difference = | R colourcode − R mesured | R colour code × 100 1 (2017). Resistor Color Table [Photograph]. Electronics For U. https://www.electronicsforu.com/electronics- projects/resistor-colour-code P a g e 1 | 4

ELN9104 Lab 2 Table 1: Resistance Measurements Digit band 1 and 2 Multiplier band % Tolerance Colour code value (Ω) Measured value (Ω) % Difference Band 1 Band 2 Colour X 10 x Colour % Value example brown black red 10 2 gold 5% 1000 991 0.9 R 1 Brown black brown 10 1 Gold 5% 100 99 1 R 2 red red black 10 0 Gold 5% 22 22 0 R 3 orange orange brown 10 1 Gold 5% 330 328 0.60 R 4 brown blue brown 10 1 Gold 5% 160 160 0 R 5 Yellow blue brown 10 1 gold 5% 460 466 1.30 5. Choose 3 resistors with a red multiplier band and complete the first two columns of Table 2. Table 2: Resistors for series circuit Colour code value (Ω) Measured value (Ω) R T calculated R T measured R 1 2200 2160 4930 4940 R 2 1000 990 R 3 1800 1780 6. Place your 3 resistors in series on the breadboard as shown in Schematic 1. Schematic 1 Schematic 2 7. Do not connect the power supply yet, calculate the total resistance by summing the individual resistors (use measured values) and then measure the total resistance using the DMM as shown in Schematic 2. Input calculated and measured values in to Table 2. 8. Complete the circuit with jumper wires and connect the DC power supply. Set the power supply, V S , to 10V. 9. Measure across the top power rails to confirm that 10V is present. 10. Measure across the side termination rails to confirm that 10V is present. P a g e 2 | 4

ELN9104 Lab 2 11. Complete column 2 of Table 3 using the voltmeter settings on the DMM: See schematic 3 for an example of how to measure V AB Schematic 3 Table 3: voltage measurements of circuit 1 Voltage (V) Schematic 1 R T of circuit in schematic 4 Voltage measurement s of circuit in schematic 4 V s 10.06 3160 10.06 V AB 2.02 3.16 V BC 3.62 0 V CD 4.40 6.88 12. Place a jumper wire from point B to point C as shown in Schematic 4. 13. Disconnect the power supply and measure the total resistance of the new circuit, add this measurement to Table 3. 14. Reconnect the power supply and measure the voltages across each resistor. Enter the measured values in column 4 of Table 3. What did you notice happened to your total resistance when the jumper wire was added? What was the voltage between points B and C? Does this value make sense? Why? 15. Remove the jumper wire between point B and C. P a g e 3 | 4 Schematic 4 It decreased by resistance of middle resistor. Voltage is 0. It make sense as voltage is zero but there was change in resistance.

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ELN9104 Lab 2 16. The black cable or COM connection is the reference ground when measuring voltage. This is the point we are measuring voltage with respect to. Complete the measurements in Table 4 but flip your probes around, measuring with the black cable at a higher potential than the red cable. For example, place the black cable at point A and the red cable at point B. Table 4: measuring voltage with the black cable at a higher potential from the red cable Voltage (V) V s -10.06 V AB -2.02 V BC -3.62 V CD -4.40 Conclusion: yes I was able to achieve the goal of this lab, I faced some difficulties, although I solved it latter. P a g e 4 | 4 What is the difference between the measurements in table 3 and table 4?

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