Naked Science Forum

General Science => General Science => Topic started by: Nanac on 21/06/2006 19:05:13

Title: Could a motor power itself by turning a dynamo?
Post by: Nanac on 21/06/2006 19:05:13: Is it possible to have a dynamo operated by a motor which in turn powered by the electricity generated by the dynamo ?
Title: Re: Could a motor power itself by turning a dynamo?
Post by: sharkeyandgeorge on 21/06/2006 21:00:02: no

J.B.S Haldane on the perforated eardrums which were a consequence of his pressure experiments "the drum generally heals up; and if a hole remains in it, although one is somewhat deaf, one can blow tobacco smoke out of the ear in question, which is a social accomplishment".
Title: Re: Could a motor power itself by turning a dynamo?
Post by: another_someone on 21/06/2006 21:36:24: Yes, but only in a limited sense.

The dynamo will generate electricity that will drive the motor, but you will lose energy through heat, and the amount of energy generated by the dynamo will always be less than the amount of energy fed into the motor, so very quickly the energy will dissipate and come grinding to a halt.

George
Title: Re: Could a motor power itself by turning a dynamo?
Post by: gecko on 22/06/2006 20:08:53: you people and your perpetual energy.

unfortunately not.
Title: Re: Could a motor power itself by turning a dynamo?
Post by: jin on 03/06/2008 08:23:40: hello
it is possible ?
a motor cant get any energy soruse from out and its running on it's own genrated power & rpm is unlimited plz ans. me
Title: Re: Could a motor power itself by turning a dynamo?
Post by: Madidus_Scientia on 03/06/2008 08:32:27: Quote from: jin on 03/06/2008 08:23:40
hello
it is possible ?
a motor cant get any energy soruse from out and its running on it's own genrated power & rpm is unlimited plz ans. me
What? No, you cannot get energy from nowhere.
Title: Re: Could a motor power itself by turning a dynamo?
Post by: lyner on 03/06/2008 12:39:34: I can make you one.
Just send me £1,000 and I will send you my prototype by return post.
(Well, folks, it's worth a try)
Title: Re: Could a motor power itself by turning a dynamo?
Post by: Andrew K Fletcher on 03/06/2008 16:27:20: The problem is it will always take more energy to turn the motor than it will take to generate the power from the alternator. Dynamo is even less efficient. It has already been shown that a hybrid between a combustion engine and an electric motor can greatly improve the mileage of a vehicle by storing electricity from electricity produced by the engine. But this is a far way from becoming a fuel free engine.

For example. If we turn on the air conditioner in a car, we get a significant reduction in engine output and higher fuel consumption. The same goes for turning on lights, turning a flywheel, a water pump, and indeed the tyres and drive shafts. All of the additions drain the output of the engine. For example, if you turn on the indicators when you stop and listen carefully you can hear the tiny fluctuations in the engines RPM that correspond to the flashing of the indicator.

So your additional dynamo would cause the engine to burn more fuel for a start.