Dinner Questions

Question:
Does a fan heat up or cool a room?

Hints:

• We are assuming a stand up fan in the middle of the room
• Assume the windows are closed and the system almost a closed system.
• It's not a very closed system since we have electricity coming in the wall and into the fan.
• Prove that it heats up a room

Answer:
Since our room is closed and we have a motor that's working and getting electricity we should expect the room to heat up. If you put your hand on the motor after it has worked a while you'll see that it's a little warm. The room should heat up slightly with the fan turned on.

So how does a fan keep you cool?