If the ceiling fan is on slow speed, does it consume less electricity?

This is just so cool! Until I had actually succeeded with the OP, I never knew that I could actually manipulate his midichlorians to mutate him into a giant three-eyed talking toad. I wonder what other Dark Side powers I possess that I have still yet to discover.

By the way, where and how did you get hold of the OP's picture anyway?

It uses the least when it is turned off.

GA, thanks for reigning us in.

There are some persons in this forum who are always just interested in making fun of new engineers who are still in process of learning. Such questions are always expected from such boys and those who do not like them, I would suggest that they should simply ignore them instead of criticizing them or making fun of them. This is rather discouraging budding engineers.

"Any mature educated person would have to brains and courtesy to .."- Oh Christ, stop with your pontificating. You are becoming more and more of a pain in the butt. I really don't understand why Admin have not blocked you from using this site. You somehow think that this site is here for you to belittle people and "show" how clever you are. You are neither mature, educated or courteous - you are just a cranky old f#"ker. Now piss off and die (Admin you can delete the last sentence if you wish but please try and regin in this idiot).

Guest,

Sorry to read your comment.We are educated technocrats and we are not supposed use such kind of language. I read comment made by our friend but I rather decided to keep mum instead of fighting unending war of words.

JRaef, you are correct once again.

One more point though is that the power factor of the motor is going to be reduced to the point that it could use almost as much current as at high speed.

If the poster doesn't understand the concept of power factor and simply uses a current measurement, he could conclude that the fan consumes almost the same "current".

This is often used to support the over unity claims. Reduce the system power factor enough and you can produce much more current for the same power. It makes that AMPs reading look good!

Regards,

Marco

provided you are not using resistive regulator to control speed

No - whatever the type of regulator used the basic concept stands. Low speed is less power (drawn from the mains) and higher speed is higher power. Of course, I am disregarding issues like power factor.

Does slower fan consume less energy?

Guys, i think this guy is worried about his electricity bill. (At least he was, before Vader's experiment).

So, friend, if you have a rheostat speed controller, you will pay the same. Slower speed won't make much difference.

In that case, the power consumed by the fan will still be less, but the heat dissipated in the rheostat will increase. As you say, the total will be about the same.

Even then power consumed will be less at lower speeds since power dissipated in the rheostat is proportional to I x R while power consumed by the motor is proportional to I**2 x R

Huh? E = IR, but P = EI = I²R.

OK - I did not put it clearly enough. At lower fan speed the current drawn will be lower than that at higher speed. Hence total power drawn from the mains will be lower. At 0 speed (caused by very high resistance) the current drawn is 0 hence power drawn is 0.

Fair enough. We shouldn't be arguing with each other; after all, we are in fundamental agreement that slow speed consumes less power, which is what this thread is about.

Can some body who has a wattmeter and ammeter take measurements of speeds of fan and current/power consumed at various taps in each kind of regulators at the input and output sides and publish in CR4 for the benifit of all

The losses in the fan regulator too should be considered depending on whether the regulator is resistor type or inductor type.Nowadays light dimmer type regulators too are used-snaban