The fan is an electrical appliance using the principles of a motor.
The fan is an electrical appliance using the principles of a motor. Can be found in a few homes, schools, offices, etc.
Questions tagged [fan]
87 questions
72
votes
9 answers
Why do fans spin backwards slightly after they (should) stop?
Today, I've decided to observe my PC fan as I shut the computer down. The fan slowly lost angular momentum over time. What I've found really interesting is the fact that the momentum vector change did not stop at the zero vector, but instead flipped…
Captain Trojan
- 813
44
votes
3 answers
What is going on in front of and behind a fan?
Why is it that when you drop paper behind a fan, it drops, and is not blown/sucked into the fan, whereas if you drop paper in front of a fan, it is blown away?
GreenAsJade
- 1,281
40
votes
4 answers
Is this cheap "air conditioner" able to cool a room?
My parents bought this "air conditioner", but I am very skeptical that this can cool a room, or even cool anything.
I doubt that it even has a cooling element, I suspect that it is just a fan + humidifier.
But even if this device had a cooling…
SinOfficial
- 503
39
votes
4 answers
Why does a moving fan seem transparent?
We all know when fan starts moving faster, we cannot see its blades. Why is this?
First I assumed persistence of vision may be the reason. But that can happen with blade also right? Image of blade can remain in our memory and moving fan can appears…
tollin jose
- 1,293
12
votes
1 answer
Why Do My Fan Blades Produce Color When They Spin?
I've posted a short video here as a visual aid.
Whenever I put my fan on Medium speed during the night time, it produces a rotating Blue and Orange color design, despite both fan blades being a white color. My primary question is, why are these…
Daniel
- 325
11
votes
5 answers
Why does a ceiling fan start up slowly?
I think it probably has something to do with the capacitor inside but I don't get it why doesn't it just Start spinning instantly when we push the button why does it slowly start to spin and gradually gets faster?
iLoveAppSec
- 173
10
votes
4 answers
Why a fan make us feel colder instead of warmer in a cold room?
Stay in a cold closed room, turn on a fan directed at you, it makes you feel colder instead of warmer. why?
Here is the definition of heat:
Matter exists in different physical forms – solids, liquids, and
gases. All matter is made of tiny particles…
Sam
- 103
8
votes
2 answers
Paper plane between two fans - is this possible?
The setup: two fans facing each other, distance around 1m. Both are turned on. In between them, place a simple paper plane and according to this video, it will fly.
https://www.youtube.com/watch?v=0ca9rxQkEiA
Is this really true? If yes, what is the…
Krumelur
- 247
6
votes
4 answers
Dyson Air Blade as a propulsion system?
I've read from many sources that Dyson Air Multipliers are more efficient and quieter than normal fans. Now, with the proof of concept, is it possible to use its principles as a propulsion system for, say, a quieter helicopter?
Bonk
- 171
4
votes
2 answers
Why are ceiling fans so much quieter than others?
I used to live in a house that had ceiling fans, which were great for the summer and so wonderfully silent when running.
Now however I've moved to a house that has no ceiling fans so I've bought a couple of standing fans. However, they're too noisy…
Richard Ev
- 143
4
votes
2 answers
How do ceiling fans cool or heat?
Why does a ceiling fan blowing air downward cool in the summertime:
whereas a ceiling fan sucking air upwards heats in the wintertime:
?
Why isn't it the other way around?
Geremia
- 2,191
4
votes
3 answers
Air flow speed and penetration abilities
As I understand, two fans with the same diameter and with the same rotor speed(usually measured in RPM) can have different air pressure(usually measured in mmH2O) and air speed(usually measured in CFM) because of fan blades design. Higher air flow…
Martin
- 43
4
votes
1 answer
Air flow coming out of a fan feels much stronger than air flow coming in. Why?
Possible Duplicate:
Why is exhaling more forceful than inhaling?
If I put my hand behind my computer's system block, I can feel a very strong flux of air coming out, as it is being pushed by the fans. However, if I put my hand in front of the…
drlemon
- 571
3
votes
1 answer
Why is the velocity of wheel double at the end than in the center?
So, I would like to know that sometimes I touch the fan while it is turned on and I can do it in the middle but can't on the edge of the fan because it hurts at the edges why?
3
votes
1 answer
Why do we feel cool when we turn our fans on?
It is a question that came to me, but evaporation doesn't seem a nice answer. Please help.
Das
- 305