Sarahisme Posted May 25, 2005 Author Share Posted May 25, 2005 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... Link to comment Share on other sites More sharing options...
Sarahisme Posted May 25, 2005 Author Share Posted May 25, 2005 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* Link to comment Share on other sites More sharing options...
Johnny5 Posted May 25, 2005 Share Posted May 25, 2005 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? Link to comment Share on other sites More sharing options...
Sarahisme Posted May 25, 2005 Author Share Posted May 25, 2005 its a standard forumla in any physics text Link to comment Share on other sites More sharing options...
Johnny5 Posted May 25, 2005 Share Posted May 25, 2005 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? Link to comment Share on other sites More sharing options...
Sarahisme Posted May 26, 2005 Author Share Posted May 26, 2005 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 Link to comment Share on other sites More sharing options...
Sarahisme Posted May 26, 2005 Author Share Posted May 26, 2005 so yeah i think what you said is correct Link to comment Share on other sites More sharing options...
Sarahisme Posted May 29, 2005 Author Share Posted May 29, 2005 so once again, thanks all for ya help Link to comment Share on other sites More sharing options...
YT2095 Posted May 29, 2005 Share Posted May 29, 2005 is it just me or is there a whole section about Comutators, brushes and slip rings missing from the thread? Link to comment Share on other sites More sharing options...
Johnny5 Posted May 31, 2005 Share Posted May 31, 2005 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. Link to comment Share on other sites More sharing options...
calbiterol Posted June 1, 2005 Share Posted June 1, 2005 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... Link to comment Share on other sites More sharing options...
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