Mentor note: Post moved from Educators and Teaching section
Hi
I would appreciate some clarity regarding using electromagnets as generators? Why are they used instead of permanent magnets specifically given that electrical power is needed? What is the difference between the power in and power...
Thank you for helping out. So, what you are saying is that the negative sign in the equation can be ignored when drawing graphs and that the Emf can either lead or lag as this is simply due to the winding...?? This is what I thought but if you see the following link the explanation of the Emf...
I would really appreciate some clarification about how to draw graphs showing changing flux and induced EMF. I understand that there needs to be a 90 degree phase difference as the EMF is a maximum when the flux has the greatest rate of change. However, our exam board says that the EMF can be...