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Search for “electrical engineering intern” alongside a discipline such as electronics, power, controls or hardware testing. The duties tell you whether a circuit, embedded project or test report is the more relevant sample.
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Choose a project for the electrical task
Electrical and electronics work includes design and testing. Read the internship's system and assignment before choosing a sample. A circuit calculation can demonstrate modeling and validation; it does not by itself demonstrate firmware, controls or power-system experience.
The example here runs entirely in software. It uses an ideal 5 V source, a 1 kΩ upper resistor and a 2 kΩ lower resistor. The output is measured in the model across the lower branch. The added load sits in parallel with that lower resistor.
Sources[1]
Work through the circuit example
Calculate the no-load and loaded cases
Without an external load, output is 5 × 2/(1 + 2) = 10/3 V, about 3.33 V. Adding a 2 kΩ load gives two 2 kΩ resistances in parallel. Their equivalent is 1/(1/2000 + 1/2000) = 1,000 Ω.
Ideal model predictions
| External load | Lower-branch equivalent | Output |
|---|---|---|
| None | 2,000 Ω | 3.333333 V |
| 2,000 Ω | 1,000 Ω | 2.500000 V |
| 20,000 Ω | About 1,818.18 Ω | About 3.225806 V |
The new output is therefore 5 × 1/(1 + 1) = 2.50 V. Use the equivalent resistance in the lower branch rather than inserting the load as another series resistor.
Change the circuit conditions
Predict the direction before calculating another case
The 20 kΩ load draws less current than the 2 kΩ load at a given voltage, so it disturbs the divider less. Its predicted output, about 3.23 V, is closer to the no-load value. That directional check helps catch a formula that has put the load in the wrong place.
The supplied divider_check.py prints the no-load and 2 kΩ cases and runs its tests. Add the 20 kΩ case yourself using divider(5, 1000, 2000, 20000); the table gives the expected value. A larger load resistance approaches the no-load prediction in this ideal model.
This is not a regulated power supply. A voltage that changes with load may be unsuitable for a requirement that demands stable output. Whether the design is appropriate depends on the actual load and voltage limits, not merely whether the unloaded arithmetic is correct.
Write a test report
Keep a prediction distinct from a measurement
For the software sample, label the numbers as calculated predictions. If you later measure a circuit in an appropriately supervised lab, record the instruments and conditions separately. A simulation result is not a physical observation.
A report that leaves room for actual evidence
| Condition | Predicted | Measured | Interpretation |
|---|---|---|---|
| No external load | 3.333333 V | Not measured | Ideal prediction only |
| 2 kΩ load | 2.500000 V | Not measured | Lower output expected because loading changed the circuit |
When a measurement differs
Prepare your project files
Submit the circuit, calculation and one changed condition
A compact sample can contain a readable schematic, the input values, script, test output and explanation of the loading result. Identify what you added to the starting example. Be ready to derive the parallel resistance without relying on a screenshot.
For embedded or power-system roles, choose a further project that matches that work rather than expanding this divider indefinitely. Ask the employer how interns learn lab procedures and who reviews their test plans. The software example requires no work on mains or unfamiliar equipment.