EET-117-Lab 7- Parallel Circuit 23W PRG

School Of Engineering Technology and Applied Science (SETAS) Advanced Manufacturing and Automation Technology (AMAT) EET 117 – Lab Instructions Section : __________________ Date: 8 March Lab #7 GROUP: ___________________ Parallel Circuits Based on Experiments in Basic Circuits by David Buchla Name: _____________________________ Name: _____________________________ Status and Signature : Objectives: 1 Demonstrate that the total resistance in a parallel circuit decreases as resistors are added. 2. Compute and measure resistance and currents in parallel circuits. 3. Explain how to troubleshoot parallel circuits. Required Instruments and Components: Power supply DMM (Digital Multi-meter) Breadboard Alligator test leads (from the EET-117 lab kit) Resistors: 1 kΩ, 4.7 kΩ, 6.8 kΩ, 10.0 kΩ (from the EET-117 lab kit)

Procedure 1. Obtain the resistors listed in Table 1. Measure each resistor and record the measured value in the table. 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 Table 1. Measured and computed resistance values (use 3 significant digits, metric prefixes). Component Listed Value Measured Value Marks R 1 1 kΩ 991 kΩ /1 R 2 4.7 kΩ 4.46 kΩ /1 R 3 6.8 kΩ 6.72 kΩ /1 R 4 10.0 kΩ 9.86 kΩ /1 Total: /4 2. In Table 2 you will tabulate the total resistance as resistors are added in parallel. (Parallel connections are indicated with two parallel lines shown between the resistors.) Enter the measured value of R1 in the table. Then connect R2 in parallel with R1 and measure the total resistance, as shown in Fig. 1. Enter the measured resistance of R 1 in parallel with R 2 in Table 2. Fig. 1 Table 2. Measured and computed resistance values (use 3 significant digits, metric prefixes). R 1 R 1 ||R 2 R 1 ||R 2 ||R 3 R 1 ||R 2 ||R 3 ||R 4 Marks R T (measured) 991 816 727 677 /12 I T (measured) 17.6 mA /3 Total /15 3. Add R3 in parallel with R1 and R2. Measure the parallel resistance of all three resistors. Then add R4 in parallel with the other resistors and repeat the measurement. Record your results in Table 2. 4. Complete the parallel circuit by adding the voltage source and the ammeter, as shown in Figure 2. Be certain that the ammeter is connected in series with the voltage source, as shown. If you are not sure, have your instructor check your circuit. Measure the total current and record it in Table 2. Perform the following steps to measure current using lab DMM (reference to the manual):

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 this lab, we explored parallel circuits and their key properties. We demonstrated that the total resistance in a parallel circuit decreases as more resistors are added, which is a fundamental aspect of parallel circuit behavior. Through measurements and calculations, we observed how the total resistance changed as resistors were added in parallel. Using the digital multi-meter (DMM), we measured resistance values and computed currents in the circuit. This helped us understand how to troubleshoot parallel circuits and verify Kirchhoff's current law, which states that the total current entering a junction is equal to the total current leaving the junction. Additionally, we learned how to simulate a burned-out (open) resistor in a circuit, which is a practical skill in circuit analysis and troubleshooting. Overall, this lab provided valuable hands-on experience in working with parallel circuits, reinforcing theoretical concepts and enhancing our practical skills in electrical engineering. Marks: / 20 Rubric-Grading Criteria Max. Marks Punctuality 10 Lab Safety 20 Procedure 40 Conclusion 20 Neatness, Spelling, Grammar, and Sentence Structure 10 Total: /100