FILE No.159Unsolved
On a hot night, in a closed room with no air conditioning, you left the refrigerator door open. The refrigerator keeps running on electricity.
What happens to the temperature of the room?
If you get stuck, open the hints one at a time, in order.
Is the back of the refrigerator hot or cold?
Where does the heat taken out go?
What is given off when electricity is used?
What happens to the temperature of the room?
Choose the answer closest to the truth.
It actually gets warmer
The answer is "It actually gets warmer."
A refrigerator expels the heat from inside out of its back into the room. With the door open, it keeps removing the heat it has cooled, and the electricity used by the motor also turns into heat. For the room as a whole, the heat only increases.
Because electricity is used, the heat increases. It will not be "unchanged."
Because cold air comes out and you think it will cool the room.
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