EET-117 LAB 6_23W PRG

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Centennial College *

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117

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Electrical Engineering

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Apr 3, 2024

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Centennial College ELECTRICAL ENGINEERING TECHNICIAN & TECHNOLOGY Course: EET-117 Name(s) Prithivi Raj Gurung Student Number(s) 301349158 Date 23 Feb Lab #6 SERIES CIRCUITS Based on Experiments in Basic Circuits by David Buchla Objectives: 1 Use Ohm's law to find the currents and voltages in a series circuit 2. Apply Kirchhoff's voltage law to a series circuit 3. Use Watts Law to find the power in resistors of the series circuit Required Instruments and Components: Power supply DMM (Digital Multimeter) Breadboard Alligator test leads (from the EET-117 lab kit) Resistors: 1.0 kΩ, 1.5 kΩ, 2.2 kΩ, 3.3 kΩ (from the EET-117 labkit) 1 | P a g e

Procedure 1. Obtain the resistors listed in Table 1 . Measure each resistor and record the measured value in Table 1. Compute the total resistance for a series connection by adding the measured values. Enter the computed total re s istance in Table 1 in the column for the listed value. A reminder of steps to measure resistance using lab DMM (a reference to the manual): 1. Connect the device under test to the instrument, as shown: 2. Select a resistance measurement function: • Press 2 to select 2-wire ohms. Ω 2. Connect the resistors in series, as illustrated in Figure 3. Measure the total resistance of the series connection and verify that it agrees with your computed value . Enter your measured value in Table 1. Fig. 3 Table 1. Measured and computed resistance values (use up to 3 significant digits, and metric prefixes) Component Listed + calculated Values Measured Values Marks R 1 1.0 kΩ /2 R 2 1.5 kΩ /2 R 3 2.2 kΩ /2 R 4 3.3 kΩ /2 R T /2 Total /10 2 | P a g e

3. C o mplete the circuit shown in Figure 4, making certa i n that th e ammeter is connected in series ; otherwise damage to the meter may result . B e fo re a p p l ying p o wer, ask your professor to check the circuit . C o mpute the current in the circuit by su b stituting the source voltage and the total resistance into Ohm's law; that is: Fig. 4 Record the computed current in Table 2 . Apply power, and confirm that your computed current is within the experimental uncertainty of the measured current . Record the measured current in Table 2. 4. In a series circuit, the same current flows through all components . We can use the total current from step 3 and Ohm's law to compute the voltage drop across each resistor . Compute V AB by multiplying the total current by the resistance between A and B . Record the results as the computed voltag e in Table 2. 5. Repeat step 4 for the other voltages listed in Table 2. 6. Measure and record each of the voltages listed in Table 2 . Table 2. Measured and computed values (use up to 3 significant digits, and metric prefixes) Computed Value Measured Value Marks I T /4 V AB (V 1 ) /4 V BC (V 2 ) /4 V CD (V 3 ) /4 V DE (V 4 ) /4 Total /20 3 | P a g e

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7. Using the source voltage (+ 15 V) and the measured voltage drops listed in Table 2, prove that the algebraic sum of the voltage rises and drops within a closed loop is zero (within experimental uncertainty) . Do this by applying the rules listed in the Summary of The o ry. Write the algebraic sum of the voltages on the first line of Table 3. The polarities of voltages are shown in Figure 4. 8. Repeat step 7 by starting at a different point in the circuit and traversing the circuit in the opposite direction. Write the algebraic sum of the voltages on the second line of Table 3. 9. Open the circuit at point B. Measure the voltage across the open circuit. Call this voltage V open . Prove that Kirchhoff's voltage law is still valid for the open circuit. Write the algebraic sum of the voltages on the third line of Table 3. Table 3. Step Numbe r Kirchhoff’s Voltage Law (Write 2 equations: A. Using Symbols, and B. Measured Values) Marks 7 A. B. /5 /5 8 A. B. /5 /5 9 A. B. /5 /5 Total /30 10. Calculate the power dissipated by each resistor (R 1 –> P 1 , R 2 –> P 2 , R 3 –> P 3 , R 4 –> P 4 ) and total power supplied by the source in the circuit (Fig. 4) based on the measured values (from Table 2) Table 4. Calculated power in the series circuit (use up to 3 significant digits, metric prefixes) Computed Values using the formula P = IV Computed Values using the formula P= I 2 R Computed Values using the formula P = V 2 /R Marks P 1 /6 P 2 /6 P 3 /6 P 4 /6 4 | P a g e

P T /6 Total /30 5 | P a g e

Conclusions. The conclusion summarizes the important points of the laboratory work. You must analyze the examples to add emphasis to significant points. You must also include features and/or things you have done /benefits of a particular procedure, instrument, component, or circuit directly related to the experiment . In conclusion, this experiment effectively demonstrated the principles of series circuits, including Ohm's Law, Kirchhoff's Voltage Law and Watt’s Laws. The results confirmed the expected behavior of series circuits, where the total resistance is the sum of individual resistances and the total current is constant throughout the circuit. The experiment also illustrated how to calculate power dissipation in resistors within a series circuit. These concepts are foundational in understanding more complex electrical circuits and their applications. Overall, the experiment was successful in achieving its objectives and provided valuable insights into the behavior of series circuits, reinforcing theoretical concepts learned in class. Marks: / 20 Rubric-Grading Criteria Max. Marks Punctuality 10 Lab Safety 20 Procedure 90 Conclusion 20 Neatness, Spelling, Grammar, and Sentence Structure 10 Total: /150 6 | P a g e

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