Room with three bulbs

Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (all are off at the moment), each switch belongs to one bulb. It is impossible to see from one room to another. How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?


  1. 1)put on the first switch for a while then turn it off
    2)turn on the next one and go to the room
    one which hot but not glowing belongs to 1st switch,,,,,one which is glowing is of 2nd and other one is of third!!


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