generator design

[Sarahisme]

now i think i have figured out that the emf that will be induced in the wire when it is spun around in the magnetic field created by the magnets will be given by this equation...

[Sarahisme]

however what i want to do is work out how much energy i can generate from this generator. I know it has something to do with the emf induced in the wire, but i don't know how to work it out. Not to sound too panicky, but i really need to work this out ASAP. aghhh... *stress stress stress*

[Johnny5]

now i think i have figured out that the emf that will be induced in the wire when it is spun around in the magnetic field created by the magnets will be given by this equation...

 

 

How did you get that formula?

[Sarahisme]

its a standard forumla in any physics text

[Johnny5]

its a standard forumla in any physics text

 

What does A represent?

 

Electromotive force = E = NBAwsin(wt)

 

i know what sinwt does, so ignoring that, N is number of turns?

 

B is magnetic field i know, and A?

 

EMF has units of volts, B has units of teslas

 

in SI F=qvB

 

so B has units of Newton second/coulomb meter

 

W=work=qV

 

volt has units of joule/coulomb

 

So the LHS has units of joule/coulomb

 

RHS has units of

 

N times (newton second)/(coulomb meter) times A times (1/seconds)

 

So we have to have:

 

N times (newton second)/(meter) times A times (1/seconds) come out in Joules.

 

A newton meter is a joule, hence

 

N times (second)/(meter^2) times A times (1/seconds) must be dimensionless

 

so

 

N times 1/(meter^2) times A must be dimensionless

 

If N is number of turns then it is dimensionless, which means that A stands for area.

 

Yes?

 

 

You called that a generator. Do you mean an electric motor, like in an electric fan? With a stator and rotor?

[Sarahisme]

e is electromotive force (emf

n is number of turns

b is magnetic field strength

a is area

and w (omega) is angular speed/velocity

t = time

[Sarahisme]

so yeah i think what you said is correct

[Sarahisme]

so once again, thanks all for ya help

[YT2095]

is it just me or is there a whole section about Comutators, brushes and slip rings missing from the thread?

[Johnny5]

is it just me or is there a whole section about Comutators, brushes and slip rings missing from the thread?

 

That's what i was thinking YT, but i think its best not to ask.

[calbiterol]

Although it probably only would have such sections if it were about the designing and building of a generator, and that would be put into engineering, wouldn't it... Wow, that sounded oddly familiar...