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Mind Games: Which Switch is Which?: Solution Back to Puzzle
 
Which Switch is Which?
Turn on two of the switches (let's say No.1 and No.2 for the purpose of this explanation) and turn the third switch (No.3) off.
Wait about ten minutes. Turn off No.1 and turn on No.3. Now, head for the porch.

If the light is off, No.1 controls the porch light. Problem solved!
If, however, the light is on, either No.2 or No.3 controls the porch light. To determine which one, touch the light bulb. If the bulb is hot, No.2 controls the porch light; if the bulb is cold, it is Switch No. 3.
 
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