From: tombiasi@optonline.net   
      
   On 9/5/2013 9:56 PM, Don Kelly wrote:   
   > On 04/09/2013 2:30 PM, Salmon Egg wrote:   
   >> In article ,   
   >>   "Paul Hovnanian P.E."  wrote:   
   >>   
   >>> Patrick Chung wrote:   
   >>>   
   >>>> Inductor current can't be suddenly cutoff  if no freewheel diode is   
   >>>> attached. New tutorial is ready   
   >>>   
   >>> Just to be pedantic: Inductor current can't be suddenly cut off even   
   >>> with a   
   >>> freewheel diode. The purpose of the diode is to give a decaying inductor   
   >>> current a path when the driving source is suddenly cut off.   
   >>   
   >> It is more than that. Free wheeling rectifier combinations such as   
   >> bridges, allow more efficient charging of capacitors by efficiency while   
   >> the capacitor has almost no charge. Diodes still dissipate some power.   
   >> Remember, repetitive charging and discharge from a non-inductive dc   
   >> source delivers V*I/2 while drawing power V*I. V is peak capacitor   
   >> voltage while I is the average (dc) current.   
   >>   
   >> My sarcastic point is that sudden changes in current in a conductor   
   >> gives large voltages should be learned very early by anyone working with   
   >> electrical circuits. I found that out early in life using dry cells and   
   >> my mother's motorized mixer.   
   >>   
   > I also learned  that by fooling around with a 6V  dry cell and an old   
   > Ford ignition coil (the kind in a nice wooden box- ). It takes skill (or   
   >   ignorance) to hold a wire in each hand and energize the primary but   
   > still get said hands across the secondary.   
   >   
   >   
   You may have also discovered that even the primary when the voltage was   
   disconnected would give a good kick.   
      
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