An introductory electrical engineering laboratory project completed in 2020 to experimentally examine the relationships between voltage, current, and resistance using physical circuit measurements, MATLAB-generated plots, and LaTeX documentation.
This project shows practical experience with:
- Building and testing simple DC circuits
- Measuring voltage, current, and resistance using a digital multimeter
- Comparing theoretical and experimental values
- Calculating percentage error
- Interpreting electrical relationships
- Presenting technical results using MATLAB plots
- Writing structured engineering reports in LaTeX
- Working collaboratively in a laboratory setting
The investigation was divided into two experiments.
A circuit was constructed using a nominal 1 kΩ resistor. The applied voltage was changed across multiple trials while the current was measured.
The results showed that current increased as voltage increased, which is consistent with Ohm’s Law:
[ V = IR ]
| Set Voltage | Measured Voltage | Calculated Current | Measured Current | Percentage Error |
|---|---|---|---|---|
| 3.0 V | 2.8 V | 3.0 mA | 2.8 mA | 6.7% |
| 4.5 V | 4.2 V | 4.5 mA | 4.2 mA | 6.7% |
| 6.0 V | 5.8 V | 6.0 mA | 5.8 mA | 3.3% |
The voltage was held at 10 V while resistance was varied using a potentiometer.
The results showed that current decreased as resistance increased, following the inverse relationship:
[ I = \frac{V}{R} ]
| Set Resistance | Measured Resistance | Calculated Current | Measured Current | Percentage Error |
|---|---|---|---|---|
| 2.0 kΩ | 1.8 kΩ | 5.0 mA | 5.4 mA | 8.0% |
| 4.0 kΩ | 3.9 kΩ | 2.5 mA | 2.5 mA | 0.0% |
| 5.5 kΩ | 5.2 kΩ | 1.8 mA | 1.9 mA | 5.6% |
The work used:
- Breadboard
- Digital multimeter
- DC power supply
- Fixed resistor
- Potentiometer
- Connecting wires
The repository also includes photographs of the circuit setup, instrument readings, report figures, and the original LaTeX project files.
The experimental results were broadly consistent with Ohm’s Law.
- Increasing voltage at constant resistance increased current.
- Increasing resistance at constant voltage reduced current.
- Percentage error remained between 0% and 8%.
- Small differences between theoretical and measured values likely resulted from instrument precision, resistor tolerance, manual adjustment, and connection resistance.
This was a collaborative university laboratory project. My involvement included participating in the experimental work, recording and interpreting measurements, supporting the comparison between theoretical and measured values, contributing to the technical analysis, and documenting the work using LaTeX.
This repository preserves the original project files, including:
- LaTeX source files
- The original laboratory report
- MATLAB-generated plots
- Circuit photographs
- Measurement evidence
- Bibliography and report formatting files
The original filenames have been preserved to maintain the project as it was created in 2020.
This was one of my earliest university engineering projects, completed at age 17.
While the experiment itself was introductory, it represents an early foundation in practical testing, data interpretation, technical writing, visualisation, and structured engineering documentation.
- Syrin Suhail Alabrach
- Rasha Al-Salem
- Mubashera Akter
Completed under the supervision of Eng. Tasnim Basmaji and Eng. Maha Yaghi.
This repository is shared for educational and portfolio purposes. It documents the original university work while preserving the original project files and media.