Recent content by billybomb87

I have a circuit-diagram for a train which in the final stages converts the power to a 3-phase AC voltage (IGBT) that is the excitation for the motors in the train. However, right before the converter module there is a power inductor. I have looked through some literature and on the internet but...

Lets assume that all properties of a piece of piezoelectrical material are known, how should the analytical calculations be performed if the goal is to convert a vibration into electrical energy? What I'm looking for is the theoretical output voltage one can achieve for a known vibration. To...

Hey everyone! I'm looking for general ideas on how to take advantages of high EM-fields created in for example , let's say, a transformer to energize a small sensor. I am not looking for specific ideas like placement, voltages etc. The reason for me asking is that this probably will be the...

Homework Statement A medium is described by the response functions \varepsilon (\omega ) and {\mu ^{ - 1}}(\omega ) in \textbf{D} = \varepsilon (\omega )\textbf{E}, \textbf{H} = {\mu ^{ - 1}}(\omega )\textbf{B}. Construct the equivalent dielectric tensor {K_{ij}}(\omega ,\textbf{k}) in...

If you look closely on the last factor there is an Xs there, does that mean that it isn't a free index? But still...haven't really understood what I am supposed to do now...please help me

Homework Statement The angular momentum density in the electromagnetic field is defined in terms of the momentum density (3.6, BELOW) by \textbf{L}_{EM} = \textbf{x}\times\textbf{P}_{EM} = \textbf{x}\times(\textbf{E}\times\textbf{B})/\mu_{0}c^2 Show that if the continuity equation for...