# Upstairs, Downstairs: Turning on a Light from Two Places

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 Areas of Science Electricity & Electronics Difficulty Time Required Short (2-5 days)
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## Abstract

Maybe somewhere in your home there's a long hallway or a stairway with a light that you can turn on from either end. It's a nice convenience, but did you ever wonder how it's wired up to work that way? The goal of this project is to build a similar circuit with switches, flashlight batteries and a flashlight bulb (obviously, household circuits are not safe to experiment with). You'll need to understand the difference between connections made in series and connections made in parallel in an electric circuit. For materials, you'll need 2 SPDT (single-pole, double throw) switches, a flashlight bulb, a bulb holder, 3 or 4 D-cell batteries and some insulated connecting wires with alligator clips. You can connect multiple D-cells together by laying them sideways and taping them end-to-end (with the + pole of one battery touching the − pole of the next, just like in a flashlight). Tape paper clips to the + pole of the top battery and the − pole of the bottom battery so you can connect them to your circuit. (Rosner, 2000)

## Bibliography

Rosner, M.A., 2000. Scientific American Great Science Fair Projects. New York, NY: John Wiley and Sons.

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### MLA Style

Science Buddies Staff. "Upstairs, Downstairs: Turning on a Light from Two Places." Science Buddies, 28 July 2017, https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p045/electricity-electronics/turning-on-a-light-from-two-places?class=AQV8pHw9TaY8ECOZur7oxaCT07Wq6hGrm5v1rAWQZhUQ28PGsjlm1m4HJHHL7imsB-GZUnNy511SV0PCPIxaRXy0. Accessed 25 Oct. 2020.

### APA Style

Science Buddies Staff. (2017, July 28). Upstairs, Downstairs: Turning on a Light from Two Places. Retrieved from https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p045/electricity-electronics/turning-on-a-light-from-two-places?class=AQV8pHw9TaY8ECOZur7oxaCT07Wq6hGrm5v1rAWQZhUQ28PGsjlm1m4HJHHL7imsB-GZUnNy511SV0PCPIxaRXy0

Last edit date: 2017-07-28

## Experimental Procedure

For this science project you will need to develop your own experimental procedure. Use the information in the summary tab as a starting place. If you would like to discuss your ideas or need help troubleshooting, use the Ask An Expert forum. Our Experts won't do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions.

If you want a Project Idea with full instructions, please pick one without an asterisk (*) at the end of the title.

## Share your story with Science Buddies!

The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.

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