Series test
- Predict what happens if one lamp is removed.
- Build two lamps in one path.
- Record brightness and remove one lamp.
- Trace where the only path breaks.
Parallel test
- Find the branch and return points on the diagram.
- Build the same two lamps on separate branches.
- Remove one lamp and record what the other does.
- Compare the result to the series test.
Reliability challenge
Build or diagram a two-light system where one lamp can be removed while the other stays on. A partner must trace the route and run the failure test.
I chose ___ because when we removed ___, the other lamp ___.