A Lightbulb Moment

Question

The three switches each control one light bulb behind the closed door. You can switch them on and off however you like but you can’t see behind the door. When you’re ready, you can enter the room only once. What plan will allow you to determine which bulb goes with which switch?

By allowing one bulb only (A) to warm up, then be turned off, when you enter the room there will be one that is off and warm (A), one that is off and cold (C) and one that is on (B).

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