Post:
You have three switches in one room and a single light bulb in another room. You are allowed to visit the room with the light bulb only once. How do you figure out which switch controls the bulb? Write your answer in the comments before looking at other answers.
Comment:
If this were an interview question, the correct response would be "Do you have any relevant questions for me? Because have a long list of things that more deserving of my precious time than to think about this!
For those that want the actual answer:
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You turn on the first switch for a minute or two, turn it off, and turn on the second switch. If the bulb is on, it’s obviously the second switch. If the bulb is off and warm, it’s the first switch. If it’s cold, it’s the third switch.
Text ambiguous. Leave doors(s) between rooms open. Flip switches, see which one controls bulb in other room. No need to even visit other room. Done in seconds.
You’d be boned if it’s an LED bulb that doesn’t warm up noticeably.
Or if it was turned on to begin with and you just turned it off
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Nice try, they recently upgraded to led lights.
Assumes that the bulb can be touched, that it is hot when turned on, and that the position of the switch for ‘on’ is the standard position.