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Riddle me this 2

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8y, 7m agoPosted 8 years, 7 months ago
Theres a light bulb in a room and outside the room there are three switches. One of the switches operates the light bulb and all three switches are on the off position. How can you determine which switch operates the light bulb if you are only allowed to enter the room once to see if the light bulb is on or not (the light is not visible from outside)?
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8y, 7m agoPosted 8 years, 7 months ago
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#1
Done this one before....Turn switch 1 on and wait 10 mins and turn it off again. Turn switch 2 on and walk into the room.....

If the light bulb is off its not switch 2 obviously.

If the light bulb is hot to touch it was switch 1.

If light bulb is cold its switch 3 :)
#2
turn the first switch on. leave it on for a few mins. turn it off. turn switch 2 on. enter the room.
If the light is on switch 2 is the one that operates it.
If the light is off but the bulb is warm switch 1 operates it.
If the light is off but the bulb is cold switch 3 operates it.
#3
melu
Done this one before....Turn switch 1 on and wait 10 mins and turn it off again. Turn switch 2 on and walk into the room.....

If the light bulb is off its not switch 2 obviously.

If the light bulb is hot to touch it was switch 1.

If light bulb is cold its switch 3 :)


Was just writing that lol
#4
swith one on and off, leave one on and leave one off. If the light is on then it's the one swithed off, if it is off but warm it is the one you swithted on and off and if it is off and cold it is the one you left off.
#5
d'oh :(
#6
I posted this last week LOL :)
#7
melu
Done this one before....Turn switch 1 on and wait 10 mins and turn it off again. Turn switch 2 on and walk into the room.....

If the light bulb is off its not switch 2 obviously.

If the light bulb is hot to touch it was switch 1.

If light bulb is cold its switch 3 :)


That's right, sorry snowtiger!
#8
or wait for someone else to show up - go in the room and shout to each other!

OR drill a hole in the wall? I do have a drill with me, right?
#9
Abvance;2057083
That's right, sorry snowtiger!

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