From: PointedEars@web.de   
      
   Kuan Peng wrote:   
   > Le 18/01/2026 à 05:28, Thomas 'PointedEars' Lahn a écrit :   
   >> It is also partially converted to heat in all electric elements which are   
   >> becoming warmer.  So for actual conductors, ISTM that there would have to be   
   >> an additional term in the continuity equation above that is describing that.   
   >   
   > Electric energy is converted to heat in the resistor.   
      
   Yes, but not only there.   
      
   > This electric energy comes from the coil B.   
   >   
   > The coil B gets the energy from the coil A.   
   >   
   > The coil A gets the energy from a battery.   
      
   Put *very* simply, yes.  But I have explained before what happens in detail.   
      
   If you have watched the video, certainly the second one, you should now   
   understand that all circuit elements receive electromagnetic energy from the   
   battery via the electromagnetic field through the air (or whatever is   
   between them and the battery) *and* via the electromagnetic field on the   
   surface of and outside the conducting wire.  (NOT from the electrons which   
   are drifting very slowly, and with an alternating current, even back and   
   forth, instead.)   
      
   As a result, a light bulb as special kind of resistor turns on after the   
   time that an electromagnetic wave needs to travel from the battery to it   
   *directly*, d/c, where d is the Euclidean distance.   
      
   It would even turn on when it is not at all connected to the circuit if it   
   were close enough to it and the field would be strong enough where it is   
   (there is an inverse-square law; such experiments have been made).   
      
   [Nikola Tesla tried to make this work over long distances (Wardenclyffe   
   Tower), but -- being a crackpot inventor, not a scientist -- he failed   
   because basically he did not consider the inverse-square law for EM waves.   
   Today we are using it successfully in wireless charging, but your mobile   
   device has to be close enough to the charging station for that to work.]   
      
   In any case, even with this simplified explanation you can see that energy   
   flows, is converted, and is not ever lost.  Even if you cannot accept the   
   dissipation of electromagnetic energy as given by the pointing vector, after   
   all, work is being done.   
      
   >> ,-   
   >> |   
   >> | In electromagnetism, Faraday's law of induction describes how a changing   
   >> | magnetic field can induce an electric current in a circuit. [...]   
   >   
   > What happens when the electric circuit has a cut?   
      
   If you watch the second video, you can see that this is the key point here:   
   It does not matter.  That is, it is not required that there is an electrical   
   conductor connecting the coils.  It is the changing magnetic field around   
   one coil, due to the changing current through it, that induces the current   
   in the other.   
      
   --   
   PointedEars   
      
   Twitter: @PointedEars2   
   Please do not cc me. / Bitte keine Kopien per E-Mail.   
      
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