ESET210Prelab910
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Texas A&M University *
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Electrical Engineering
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Feb 20, 2024
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Texas A
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Pre-Lab Experiment 9-
10
ESET 210-509
Contact: Caleb Sparks (729009916)
2
Pre-Lab Experiment DC 9: Series-Parallel dc Circuits
Purpose:
In this experiment,students will test the theoretical analysis of series-parallel networks through direct measurements. They will aim to improve skills regarding identifying series or parallel elements. Students will also be able to measure the voltages and currents of a series-parallel network while practicing Kirchhoff’s voltage and current laws, the current divider law, and the voltage divider law.
Materials:
Resistors:
1
1-kΩ, 2.2-kΩ, 3.3-kΩ, 4.7-kΩ, ¼-W film resistors
Instruments:
1 DC Power Supply and 1 DMM (Digital Multimeter)
Procedure:
1.
Part 1: Build the circuit shown in Fig 9.1 and find the measured value of each resistor. Using these values, find the total resistance of the circuit. Measure total resistance using the ohmmeter and find the percent difference between the measured and calculated values. Apply 12V to the circuit and calculate Is, I1, I2, and I3. Use a milliammeter to find the previously mentioned currents then determine how I1 and Is are related. Using the previous results, calculate and also measure V1, V2, and V3. Determine how V2 and V3 are related and if E = V1 + V2 applies, as shown in Kirchhoff’s voltage law. Record all data in appropriate tables.
2.
Part 2: Build the circuit shown in Fig 9.3 and find the measured value of each resistor. Using these values, find the total resistance of the circuit. Measure total resistance using the ohmmeter and find the percent difference between the measured and calculated values. Apply 12V to the circuit and calculate Is, I1, I2, and I3. Use a milliammeter to find the previously mentioned currents then determine how I2 and I3 are related. Determine if Is = I1 + I2 as shown by Kirchhoff’s current law. Using the previous results,
calculate and also measure V1, V2, and V3. Calculate the percent difference between each calculated and measured voltage. Determine how the voltages E, V1, and the sum of
V2 and V3 are related. Record all data in the appropriate tables.
3.
Part 3: Build the circuit shown in Fig 9.5 and find the measured value of each resistor shown. Determine how the total voltage across the two series elements R1 and R2 are related to E, the applied voltage. Determine how the total voltage across the two series elements R3 and R4 are related to E, the applied voltage. Use the voltage divider rule, calculate the voltages V2 and V4 then use the voltmeter to measure the voltages. Using Kirchhoff’s voltage law, calculate Vab then use the voltmeter to measure Vab. Determine
if Vab is equal to V3-V1 then calculate the current Is. Measure the current Is using the milliammeter and calculate the percent difference between the calculated and measured. Record all data in the appropriate tables.
4.
Part 4: Construct the circuit shown in Fig 9.6 and find the measured value of each resistor. Using the measured resistor values, calculate the voltage V4. Using the
3
voltmeter, measure V4 then calculate the percent difference between the two. Measure the current Is and find the total input resistance from Rt = E/Is. Disconnect the power supply and measure Rt using the ohmmeter then find the percent difference between the calculated and measured values. Record all data in the appropriate tables.
Pre-Lab Experiment DC 10: Power ratings of resistors
Purpose:
In this experiment, students will build three circuits using a source resistor and up to three load resistors. The load resistors are different from the source resistor by their respective resistance and power ratings. Students will set the power supply voltage so that in every circuit used, each load resistor will receive the proper power for its rating. Students will monitor the power to each source resistor and if the power should exceed its rating, the student will suggest a circuit modification that will deliver the proper power
Materials:
Resistors:
1
100-Ω ½ -W film resistors
2
330-Ω ¼-W film resistors
Instruments:
1
DMM (Digital Multimeter)
1
dc Power Supply
Procedure:
1.
Part 1: Build the circuit shown in Fig 10.1, calculate the maximum load voltage for the 250 mW power provided to each resistor. Use the formula, V(load) = sqrt((250mW)(R2))
to calculate the maximum load voltage. Connect the DMM across R2 then slowly increase the voltage until the voltage is at the maximum calculated value. Measure the current through R1 and R2. Use the previously calculated current values and the equation
P = IR^2 to calculate the power through each of the two resistors. Record all data in the appropriate tables.
2.
Part 2: Build the circuit shown in Fig 10.2, calculate the maximum load voltage for the 250 mW power provided to each resistor. Use the formula, V(load) = sqrt((250mW)(R2))
to calculate the maximum load voltage. Connect the DMM across the parallel combination of R2 and R3 then slowly increase the voltage until the voltage is at the maximum calculated value. Measure the current through R1, R2, and R3. Use the previously calculated current values and the equation P = IR^2 to calculate the power through each of the three resistors. Record all data in the appropriate tables.
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4
3.
Part 3: Build the circuit shown in Fig 10.3, calculate the maximum load voltage for the 250 mW power provided to each resistor. Use the formula, V(load) = sqrt((250mW)(R2))
to calculate the maximum load voltage. Connect the DMM across the parallel combination of R2, R3, and R4 then slowly increase the voltage until the voltage is at the maximum calculated value. Measure the current through R1, R2, R3, and R4. Use the previously calculated current values and the equation P = IR^2 to calculate the power through each of the four resistors. Record all data in the appropriate tables.
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