Lab 03

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Electrical Engineering

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Dec 6, 2023

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Print name (first last): Deep Lab partner (first last): Prajapati Course: ECET 17700 Lab date (mm/dd/yy): 09/07/2023 Instructor: Cheung April 03. EET Basics – DC Circuit Measurements Performance Checks 0. Prelab 1. Resistance Measurement 2. Voltage across Resistors 3. Node voltage measurements

ECET 17700 - 2 - 03. EET Basics – DC Circuit Measurements For Prelab Credit: 1. Show work on #2 calculations and answers. 2. Completed one column in Table 4, 3. The three resistors needed for the lab 0. Prelab Each student must complete the following before the start of lab period: 1. Read the laboratory Objectives and Experimental Procedure. This helps ensure that you are ready to participate in lab and are prepared to finish the lab within the provided time. 2. Review the circuit in Figure 1, calculate the following values. Show your work and put a square around your answers. Total resistance of R1, R2, R3 Voltage across R1, R2, R3 Voltage at node A, B, C, D Complete the Theoretical Node voltage in Table 3 and 4 3. Find the three resistors in your lab kit, set them aside for the lab. 1. Objectives In this lab you will: • Construct and verify total resistance in series circuits • Measure resistors voltage drops, single-subscript node voltage and double-subscript node voltages 2. Experimental Procedure 1. Measure Resistance: a) Measure and record the resistance of each individual resistor show in the circuit ofFigure 1. Record their value in Table 1. E supply voltage is 5V Table 1: Series Circuit Resistances Resistor Nominal resistance (Ω) Measured resistance (Ω) Percentage Error (%) R1 820 811 1.10% R2 1000 983 1.7% R3 4700 4688 0.25% RT 6.52 kOhms 6.43 kohms 1.38%

ECET 17700 - 3 - 03. EET Basics – DC Circuit Measurements Figure 1: Series Circuit Schematic Figure 2: Protoboard Configuration b) Wire the circuit shown in Figure 1. Figure 2 shows how the circuit should be constructed on your protoboard. Wire the circuit neatly as shown in the diagram, usingyour pre-cut wiring kit. It must be neat with resistor trimmed and close to the board. Use only wires from your 140 wire kit. Loopy header wires will not be tolerated and ripped out of the circuit! c) Notice the light green coloring in the fritzing schematic, this shows the breadboard continuity. d) With the power supply (E) not connected, measure the total resistance of the circuit, and enter it in Table 1 as RT. Compare this value with your calculated value from prelab. For Sign Off 1: Show and demonstrate to the instructor your completed Table 1 2. Series Circuit Component Voltages a) Fill in the Table 2 the calculated voltage values across each resistor in the calculatedvalue column. b) Using the DMM, adjust the DC power supply 2 to the value 5 V, then connect thesupply to the circuit. c) Measure the voltage drops across each resistor and record them in Table 2. Table 2: Series Circuit Component Voltages Resistor Calculated voltage (V) Measured voltage (V) Percentage Error (%) E 5 VR1 0.630 V 0.630 0% VR2 0.766 V 0.764 0.26% VR3 3.604 V 3.602 0.06 % For Sign Off 2: Show and demonstrate to the instructor your completed Table 2

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ECET 17700 - 4 - 03. EET Basics – DC Circuit Measurements 3. Node Voltages a) If you haven’t done so yet, complete Table 3 and Table 4, Theoretical node voltage column b) Using the DMM, measure the node voltage according to the node names in Figure 1. Table 3: Node Voltages (single-subscript) Node Theoretical voltage (V) Measured voltage (V) Percentage Error (%) VA 5V 5V 0% VB 4.37 V 4.36V 0.07% VC 3.604 V 3.602 V 0.06% VD 0 V 0 V 0% c) Using the DMM, measure the node voltage according to the node names in Figure 1. Table 4: Node Voltages (double-subscript) Node Theoretical voltage (V) Measured voltage (V) Percentage Error (%) VAB 0.630 V 0.630 V 0% VAC 1.396 V 1.394 V 0.14% VAD 5 V 5 V 0% VBA -0.630 V -0.630 V 0% VBC 0.766 V 0.764 V 0.26% VBD 4.37 V 4.36 V 0.22% VCA -1.396 V -1.394 V 0.14% VCB -0.766 V -0.764 0.26% VCD 3.604 V 3.604 V 0% VDA -5 V -5 V 0% VDB -4.37 V -4.36 V 0.22% VDC -3.604 V -3.604 V 0% For Sign Off 3: Show the instructor your completed Table 3, Table 4 3. Analysis and Conclusions 1. Calculate the current through each resistor?  Since, Total Current = 5/6520 = 0.77 mA. The current through each resistor is 0.77 mA. 2. Demonstrate KVL using the measured data.  Vt - V1 - V2 - V3 = 0  5 – 0.632 – 0.765 – 3.602 = 0.01 V 3. Describe the proper DMM configuration when measuring a double-subscript node voltage.  For example, If I want to check for Vab, I would connect the positive minigrabber from DMM to node ‘ a ’ and the negative minigrabber from DMM to node ‘ b ’ .