Puzzle

by OceanzestHamilton, Waikato, New Zealand

Feb 2023 271 Views 6 comments

Puzzle

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

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Posted: Feb 2023

About this poem:

spotted this brain teaser, can you solve it

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Comments (6)

online today!

lovecanberealSydney, New South Wales AustraliaFeb 13, 2023

By using a reinforced glass door?Who said doors have to be made of wood?

online today!

lovecanberealSydney, New South Wales AustraliaFeb 13, 2023

In fact, there are many such doors, if one cares to look.

OceanzestOPHamilton, Waikato New ZealandFeb 13, 2023

good thinking but not the answer lovecanbereal, assume its opaque!
Clue: lightbulbs give out more than light

BumdartMurcia, SpainFeb 21, 2023

I can tell simply by asking Google

Switch on switches 1 & 2, wait a moment and switch off number 2. Enter the room. Whichever bulb is on is wired to switch 1, whichever is off and hot is wired to switch number 2, and the third is wired to switch 3

OceanzestOPHamilton, Waikato New ZealandFeb 22, 2023

you got it Bumdart

Yankee4youSt. Albans, Vermont USAFeb 23, 2023

Turn on the first light switch and leave it on for a little while then turn it off. Turn on the next light switch and open the door. Now go into the room and briefly feel all three light bulbs; the warm one is the first switch,, the one that is still on is obviously the second light switch and the cold light bulb is the last switch that you didn't touch.