I like EM thinking about the necessary vibration.
What if.... and now rant mode is on!Current carrying wires are creating magnetic fields. The amount of DC current flowing in a wire could be calculated by the ohm's law, knowing the RESISTANT of the wire segment. Placing a wire to an external magnetic field (90 degree), and switching on the flow, the result will be the magnetic force will appear, which will MOVE the wire. The strength of magnetic force on the wire will depending on the current strength, the length of the wire segment, and the strength of the EXTERNAL FIELD. Basically we can increase the force by introducing bigger external fields.
We usually carry currents to the loads from the sources,which currents dissipated as converted work in time, and cost us real work in time, or
from sources to sources!
In the latter case, the flowing currents are recoverable, except the loss caused by the circuit resistant. In the ideal circuit, we could transmit energy from one point to another without any losses. In the real word circuits, the resistant of the wires will dissipate some of the work, creating HEAT! Wait, not magnetic fields? So a superconductor wire could carry DC current from one point to another, without any losses, and in the meantime still generating magnetic field. Sometimes, when I step up from the reality like EM do
, I'm thinking because of the AC currents came in to the picture, we missed the whole point about the power generation by magnetic fields, and wires, and....
Please follow this example: a very big rod magnet floating in the space, and we imagine ourselves in a big glass ball with some charged battery, cap, and wires, and we start to play. We use a short wire, and discharge a cap to it in our hands, and we will see the movement imparted on us, and if our legs touched the ball, on the whole. If we would have a thousand source, and we discharge all at the same time, each one to a short wire, the movement would be bigger. This movement in our reference frame, in the glass ball,
was not convert able, hence we just moved freely in space! If we would do the same, in the earth gravity field, and the force was directed upwards ( yeah, would require a LOT of current), we would float the same, on the magnetic field of the big magnet, but when the cap discharged fully, the inevitable will come, and we will FALL BACK. The gravity was necessary to convert the resultant movement of the ball, to recoverable work! I guess, any material could do the same, make this force recoverable.
So, educated guys here, please correct me! Tell me why the amount of LOSS in a short wire which carrying DC current changing when subjected to different strength external magnetic fields?
"A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away." Antoine de Saint-Exupery
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Topic: What is Known about the TPU (Read 442534 times)
