ESET210Prelab67

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Texas A&M University *

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210

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Electrical Engineering

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Feb 20, 2024

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1 Texas A & M University Pre-Lab Experiment 6&7 ESET 210-509 Contact: Caleb Sparks (729009916)

2 Pre-Lab Experiment DC 6: Parallel Resistance Purpose: In this experiment, students will determine the total resistance of a parallel network using an Ohmmeter or using Ohm’s Law. Students will also examine the effect of relative magnitude of each parallel resistor on the total resistance. Students will become more familiar with parallel circuits and how to identify them Materials: Resistors: 1 100-Ω, 1-kΩ, 1.2-kΩ, 2.2-kΩ, 100-kΩ, ¼-W film resistors 3 3.3 k-Ω (¼-W film resistors) Instruments: 1 DC Power Supply and 1 DMM (Digital Multimeter) Procedure: 1. Part 1: Construct the circuit shown in Fig 6.3 and take the measured values of R1 and R2. Using these, calculate the total resistance, then use the DMM to measure the total resistance. Compare your results using percent difference. Set voltage to 10V then record the ammeter reading. Using the prior reading, calculate the total resistance then compare to previously measured values (ignoring voltage drop). Determine whether total resistance of a parallel network will always be less than the smallest resistor. Record all in Table 6.1. 2. Three Parallel Resistors: Construct the circuit shown in Fig. 6.5, find the measured values of R1, R2, and R3. Calculate the total resistance using these then measure total resistance using the DMM. Use these to calculate the percent difference and compare. Repeat the process in part 1 then compare the results. Answer questions written in part 2(f). Record all in Table 6.2. 3. Equal Parallel Resistors: Construct the circuit shown in Fig. 6.6, find the measured values of R1, R2, and R3 Assume all resistors have a nominal value of 3.3-kΩ. Calculate the total resistance using these then measure total resistance using the DMM. Calculate percent difference using the prior values then compare. Record all in Table 6.3. 4. Different Levels of Resistance: Construct the circuit shown in Fig. 6.7, find the measured values of R1, R2, and R3. Calculate the total resistance using these then measure total resistance using the DMM. Use these to calculate the percent difference and compare. Calculate the total resistance if R3 is ignored, then calculate the total resistance if R2 and R3 are ignored. Draw conclusions from the results you observe then find if your conclusion is verified. Record all results in Table 6.4. 5. Open Circuits: Construct the circuit shown in Fig. 6.8, find the measured values of R1, R2, and R3. Calculate the total resistance using these then measure total resistance using the DMM. Use these to calculate the percent difference and compare. Determine the impact of the 2.2-kΩ resistor and record all data in Table 6.5

3 6. Short Circuits: Construct the circuit shown in Fig 6.9 and take the measured values of R1 and R2. Using these, calculate the total resistance, then use the DMM to measure the total resistance. Using your results, determine the impact of the lead across R2 in Fig. 6.9. Record all data in Table 6.6. Pre-Lab Experiment DC 7: Parallel DC Circuits Purpose: In this experiment, students will examine the currents and voltage of different parallel dc networks. In doing so, students will verify Kirchhoff’s Voltage Law. Another goal of this lab is to test the different applications of the current divider rule. Finally, students will continue becoming more familiar with lab equipment and tools. Materials: Resistors: 1 1-kΩ, 1.2-kΩ, 3.3-kΩ, 4.7-kΩ, 10-kΩ, 1-MΩ ¼-W film resistors 2 2.2-kΩ ¼-W film resistors Instruments: 1 DMM (Digital Multimeter) 1 dc Power Supply Procedure: 1. Basic Measurements: Build the circuit shown in Fig 7.3, measure the values of R1 and R2, then calculate the total resistance of the network. Using the DMM, measure total resistance and determine how the total resistance compares with the smaller of the two measured resistors. Apply 12V to points 1-2 of Fig 7.3 then measure VR1 and VR2 using the DMM. Draw conclusions about voltage across parallel elements and determine how the levels of VR1 and VR2 compare with the applied voltage E. Calculate the currents (mA) through R1 and R2 using both measured resistor values and Ohm’s Law and determine the source current using Kirchhoff’s Law. In Fig 7.4, measure I1, I2, and I3 using the DMM in ammeter mode and compare your results with the calculated values. Determine the total resistance and compare it to the measured value. Record your results in the appropriate tables. 2. Equal Parallel Resistors: Build the circuit shown in Fig 7.5, measure the values of R1 and R2, then calculate the total resistance of the network. Use the DMM and connect between points 1-2 and take a measurement. Calculate the total resistance using measured values, then calculate the percent difference and determine if you can approximate the prior conclusion. Apply 12V to points 1-2 of Fig 7.5 then measure I1 and I2 using the DMM. Draw any necessary conclusions then using results calculate the current I.

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4 Measure the current I, with E=12V and compare to the previously calculated value. Record your results in the appropriate tables. 3. Current Division: Build the circuit shown in Fig 7.6, measure the values of R1 and R2, then draw a conclusion on how you expect the currents I1 and I2 to be related. Using the DMM, measure I1 and I2, verify conclusions, then using measured resistor values, calculate the current I. Using the measured currents, calculate the current I then compare to the previously calculated value. Build the network shown in Fig 7.7 and measure R1, R2, and R3. Without using any calculations, determine how you think I3 would compare to the other currents. Using the values of R1 and R2, determine the relationship between I1 and I2. Then, compare I1 and Is, record all previous results in the appropriate tables. Verify your previously drawn conclusions. Without using any calculations, determine the expected total resistance and explain your reasoning. Finally, using the applied voltage E and measured current Is, calculate the total resistance and compare it to the estimated value.