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Grand Canyon University *
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Electrical Engineering
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Apr 3, 2024
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1 Introduction to Measurements with NI ELVIS Lab Report Ryan Smith Engineering Department, Grand Canyon University EEE-202L Dr. Rodriguez January 21, 2024
2 Abstract In this lab report, we conduct experiments with electric circuits using the NI ELVIS III platform. The purpose is to gain practical insights into voltage and current measurements in both linear and non-linear circuits. The methods involve building circuits on the prototyping board, utilizing NI ELVIS components, and employing LabVIEW for data acquisition. The circuits studied include a resistor, LED, and voltage/current dividers. Introduction The purpose of this work is to explore fundamental concepts in electric circuits and measurements. Key objectives include understanding voltage and current measurements using NI ELVIS III, applying Ohm's law, and studying the behavior of circuits with different components. The circuits examined are a resistor, LED, and voltage/current dividers. Each circuit serves a specific purpose in demonstrating electrical principles. Relevant Background and Theory Ohm's Law, a fundamental principle in electrical engineering, expresses the relationship between voltage (V), current (I), and resistance (R) as V = IR. This equation is important for studying circuits because voltage measurements across resistors follow its principles. The subsequent experiments, which focus on resistor circuits and LEDs, provide a practical application of Ohm's Law, improving our understanding of circuit behavior. Ideal Results Using ohms law we can determine our ideal results from the stated values given in the experiment. V = I * R. Current divider •
V1=V2=U=5 V
3 •
I1=5/100=0.05=50 mA •
I2=5/220=0.0227=22.7 mA •
I3 = I1+I2= 72.7 mA Voltage divider •
I=5/100+220=5/320=0.015625-15.6mA •
V1=100(5/320)=1560mV=1.56 V •
V2=220(5/320)=3.44 V Materials, Procedures, and Measured Data •
NI ELVIS III prototyping board •
Resistors: R1 (100 ohms), R2 (220 ohms) •
Multimeter •
Variable Power Supply (VPS) •
Cables with alligator clips •
LabVIEW software (for NI ELVIS III control) •
Multisim simulation software 1.
Gather all materials and build voltage divider circuit on the ELVIS board. 2.
Record values for both resistors. 3.
Record values for voltages across the circuit 4.
Build current divider 5.
Record all values
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4 Voltage Divider Current Divider Data R1 = 97.3 ohms, R2 = 216.2 ohms, U = 5.06 V Expected Results Voltage Divider I = 5.06/313.5=0.0161=16.1 mA
5 V1=97.3(5.06/313.5)=1.57 V V2=216.2(5.06/313.5)=3.49 V Current Divider I1=5.06/97.3=0.0520 A= 52 mA I2=5.06/216.2=0.0234 A = 23.4 mA I=0.052+0.0234=0.0734= 73.4 mA Comparison of Expected and Actual Results Voltage Divider Actual Results I = 16.1 mA V1= 1.57 V V2=3.48 V Compared with the expected results we see that the only measured difference was with V2 being 0.01 V less than expected, otherwise the actual results are satisfactory. Current Divider V1=5.007 V = V2 = U I1= 52 mA I2 = 23.4 mA I3 = 73.4 mA Compared to the expected results they are identical besides the voltage; these results are satisfactory.
6 Possible explanations for the measured differences could stem from the equipment used in the lab, such as the multimeter, resistors, power supply, etc., leading to possible inconsistencies. Summary/Conclusion In conclusion, the NI ELVIS III platform was utilized to create voltage and current divider circuits in this lab. We carried out ideal simulations, theoretical evaluations, and real-
world applications. Through the comparison of theoretical predictions with experimental observations, important insights into the behaviors of voltage and current division were obtained. This practical experience strengthens theoretical notions in real-world applications and improves our grasp of electrical circuits.
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