Recent content by MRKN

I contend this cannot be done! A popular method of modeling non-linear cores is to obtain the values for remnant flux density, saturation flux density, and the coercive force at some major hysteresis curve, and to then mathematically extrapolate a curve (a few other parameters are also needed...

This is a problem I stumbled upon after noticing a pattern in the lab- the measured current was never quite what you'd expect from the turns ratio of either transformer alone, but somewhere in the middle. I used 50:5 nominal turn toroidal CTs with 15 turns in one CT primary and 5 turns in...

Think of it this way, power is instantaneous, ie power occurs at the smallest imagineable fraction of time you can possibly consider. So to find energy, you take power and multiply it by some quantity of time. Energy is a way to explain what comes out of power applied for some duration of time.

Thanks Ben for the very useful conceptual answer. If you wouldn't mind answering a follow-up question. Should we constrain the rotation of the permanent magnet, it will be forced to decrease it's magnetic strength proportionally to the speed at which is travels (higher speeds mean higher rates...

Clem- Is it not true that fields do not actually exist? Rather they are a sort of mathematical tool. I don't see how a field can have angular momentum. This seems like a mere mathematical convenience. Could you please refer me somewhere that would explain how fields can have momentum.

Imagine a metal hoop floating in a plane parallel to the Earth's surface, with a permanent magnet suspended above it. The magnet is then dropped straight through the center of the hoop. From Faraday's Law, a current is induced in the hoop as the magnet passes through. There is now angular...