You have just moved into an old house with a basement and an attic. There are three switches in the attic, marked "on" and "off". The three switches are connected to three bulbs in the basement.

You have to find out which switch is connected to which bulb. You are allowed to play with the switches for as long as you need to, but you may only go down into the basement once to check the bulbs and then say which which switch is connected to which bulb.

 

Hint: You don't need any knowledge about electrical wiring to solve this puzzle.
 

Adapted from: Das Glühbirnen-Rätsel

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