BUILD CARD · EASY
Lamp and Fan in Series
Recreate manual Project 27 with the lamp and motor sharing one current path.
- Time
- 15 min
- Age
- 8+
- Pieces
- 6
- Board
- 10×7
- Build and check a 10×7 snap-grid circuit from a visual diagram.
- A series lamp and motor share one current, so each changes the energy available to the other.
02 / PARTS CHECK
Parts list
- 1×7-snap wireconnector
- 1×3-snap wireconnector
- 1×2.5V lamplamp
- 1×Motoroutput
- 1×Slide switchswitch
- 1×3V two-cell battery holderpower
03 / ASSEMBLY
How to build the circuit
- 1
Disconnect the battery and clear the base grid before placing any part.
- 2
Match the final diagram one grid position at a time, placing connecting wires and lower layers first.
- 3
Check the direction of every LED, diode, transistor, battery, and other terminal-sensitive part.
- 4
Press every shared snap firmly, check that no wire shorts the battery, then connect power last.
04 / FIELD NOTES
How it works
The lamp and motor share the same series current.
Each load receives only part of the battery voltage.
Opening either connection stops both loads.
Explore more lamp circuit projects →
05 / TEST
Test and expected result
- What to do
- Close the switch and compare both loads with their separate circuits.
- What to expect
- The lamp is dimmer and the fan slower because both share one current path.
06 / SAFETY
Build smart
- Use only the 3V two-cell battery holder.
- Never connect the battery terminals directly together.
- Disconnect the battery before moving any component.
- Keep fingers and loose objects away from the fan.
07 / TROUBLESHOOTING
If it does not work
- Press every overlapping snap down firmly.
- Check the battery direction and replace weak batteries.
- Compare every component position with the final diagram.
08 / FREQUENTLY ASKED QUESTIONS
Questions about this circuit
What is the main idea behind this circuit?
A series lamp and motor share one current, so each changes the energy available to the other.
What should I check first if it does not work?
Press every overlapping snap down firmly.
09 / RELATED BUILDS
Try a similar circuit
Continue with another build that shares the same components, ideas, or difficulty.
Hear the Motor
Recreate manual Project 30 by putting a motor and speaker in the same current path.
Lamp and Fan in Parallel
Recreate manual Project 29 with separate lamp and motor branches across the battery.
Two Lamps in Series
Place two identical lamps in one current path and compare their brightness with a parallel circuit.