EETQ 114 Lab 5 - Combination Circuits (1)

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Centennial College *

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EETQ114

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Electrical Engineering

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Apr 3, 2024

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Page 1 of 4 Centennial College Electrical Engineering Technician / Technology EETQ-114 Electronics 1 and Instrumentation 1 LAB #5 Combination Circuits Objectives:  Use the concept of equivalent circuits to simplify series-parallel circuit analysis.  Compute the currents and voltages in a series-parallel combination circuit and verify your computation with circuit measurements. Theory: Most electronic circuits are not just series or just parallel circuits. Instead, they may contain combinations of components. Many circuits can be analyzed by applying the ideas developed for series and parallel circuits to them. Remember that in a series circuit the same current flows through all components and that the total resistance of series resistors is the sum of the individual resistors. By contrast, in parallel circuits, the applied voltage is the same across all branches and the total resistance is given by the reciprocal formula. In this experiment, the circuit elements are connected in composite circuits containing both series and parallel combinations. The key to solving these circuits is to form equivalent circuits from the series or parallel elements. You need to recognize when circuit elements are connected in series or parallel in order to form the equivalent circuit. For example, in Figure A we see that the identical current is in both R 2 and R 3 . We conclude that these resistors are in series and could be replaced by an equivalent resistor equal to their sum. Figure B illustrates this idea. The circuit has been simplified to an equivalent parallel circuit. After finding the currents in the equivalent circuit, the results can be applied to the original circuit to complete the solution. Name: Student #: Section: Date: Figure A Figure B

Page 2 of 4 The answer to two questions will help you identify a series or parallel connection: 1. Will the identical current go through both components? If the answer is yes, the components are in series. 2. Are both ends of one component connected directly to both ends of another component? If yes, the components are in parallel. The components that are in series or parallel may be replaced with an equivalent component. This process continues until the circuit is reduced to a simple series or parallel circuit. After solving the equivalent circuit, the process is reversed in order to apply the solution to the original circuit. This idea will be studied in this experiment. Equipment: • Breadboard • Variable DC Power Supply (BK Precision 1672) • Alligator test leads • DMM (Keithley 2110) • Resistors: 100 Ω, 270 Ω, and 470 Ω Procedure: 1. Select the following three resistors from your kit and using your ohmmeter measure the three resistors and fill out the table below as indicated. Resistors Color Code Value Tolerance Range Measure Value R A = 100 Ω R B = 270 Ω R C = 470 Ω 2. On your breadboard build the circuit below using the selected and measured resistors of step 1 3. Using the color code values of resistance determine the total resistance of the circuit and record below: Calculated Total Circuit Resistance (R T ) = ___________ Ω Tolerance Range = _______ to ______Ω 4. With the power supply OFF and disconnected from the circuit, measure the total resistance of the circuit between the input leads and record its value below. Measured Total Circuit Resistance (R T ) = ___________ Ω 5. Compare the values in steps 3 and 4, are the values within the tolerance range of the resistors you are using? ( YES / NO ) Figure 1 Figure 2 – measuring

Page 3 of 4 6. What would you conclude about resistors in series -parallel from your answer to step 4? 7. Using an applied voltage of 10 volts determine the calculated current that would be flowing through the circuit for the calculated resistance determined in step 3 and record below. Calculated Circuit Current (I S ) = ___________ A 8. Using a voltage of 10 volts , with the power supply ON connect the Ammeter in the circuit and complete the table below. Ammeter Position Ammeter Reading (A) I S = I A I B I C 9. Compare I S , I B , and I C . How would you explain your results? 10. Measure the voltage drop across R A , R B , and R C , record your readings in the following table. Voltage Drop Voltage Reading (V) V A V B V C 11. Compare V A , V B , and V C . How would you explain your results? Questions: 1. For the following circuit calculate I T (Total Current) and R T (Total Resistance).

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Page 4 of 4 2. In the following circuit, assume you found that I T was the same as the current in R 3 and R 4 . What are the possible problems? 3. The following circuit has three equal value resistors. a) If the voltmeter reads + 8.0 V, find the voltage drop across R1. b) What is the value of the source voltage VS? Conclusion: State briefly, but clearly, what you have gained from this assignment. Lab Submission: - Please submit this lab report at the beginning of the next lab class for a full grade. Criteria Max Grade Materials, Tools and Equipment Set-up 1.5 Following Procedure 2 Data Collection and Analysis 2 Evaluation of Experiment, Review Questions 2 Conclusion 1.5 Spelling, Grammar, Sentence Structure 1 TOTAL

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