Computer Lab Project

Conductors and Insulators Lab

Find out whether a paperclip, wooden craft stick, or other approved material closes the circuit. A surprising result earns a second test.

Program: Robotics
Project type: Computer Lab Project
Difficulty: Builder
Estimated time: 45-75 minutes

Project brief

What students build

A safe low-voltage test method or simulation
A material list
Predictions
Observed results
A classification rule
A final explanation

What students learn

Closed circuits
Conductivity
Controlled tests
Recording evidence
Classification
Unexpected results

What students need

Paper planning and browser simulator
Physical version requires teacher-selected low-voltage components and safe materials

For a physical test, use only teacher-arranged low-voltage components and approved materials. Never test outlets, mains electricity, unknown liquids, or unsafe materials.

Computer Lab brief

Choose teacher-approved samples and a consistent test method. Record predictions first, repeat surprising results, and keep the low-voltage safety rules fixed.

Required systems

What must exist.

A safe low-voltage test method or simulation
A material list
Predictions
Observed results
A classification rule
A final explanation

Suggested build order

One useful route through the problem.

Define a safe test Identify what will count as a completed circuit.
Choose materials Select ordinary teacher-approved samples and predict results.
Run one controlled comparison Keep circuit and contact points consistent.
Record evidence Track predicted and observed results separately.
Investigate surprises Retest one unexpected material and inspect connections.

Checkpoints

1The test has one visible output.
2Predictions are recorded before testing.
3The output difference can be observed.
4Every classification has a recorded test.
5The conclusion acknowledges test limits.

Challenge cards

Choose one, combine compatible cards, or propose an equivalent challenge.

CHALLENGE 1

Build a result table.

CHALLENGE 2

Test coated and uncoated versions safely.

CHALLENGE 3

Create a mystery-material challenge.

CHALLENGE 4

Explain one ambiguous result.

Test questions

Is the circuit itself working?
Are contact points consistent?
Was each result repeated?
Could coating affect the result?
Does classification match the recorded evidence?

Common mistakes

Loose connections create false negatives.
The indicator is not tested first.
Samples differ in several uncontrolled ways.
A prediction is rewritten after the test.

Extension ideas

Build a result table.
Test coated and uncoated versions safely.
Create a mystery-material challenge.
Explain one ambiguous result.

Challenge levels

LEVEL 1

Builder

Classify five teacher-approved materials.

LEVEL 2

Inventor

Improve the test to reduce contact errors.

LEVEL 3

Boss Level

Design a fair mystery-material protocol for another group.

What to demonstrate

Safe test plan
Recorded predictions
Controlled comparisons
Evidence table
Retested surprise
Qualified conclusion