Posted by 36 coupe on April 02, 2011 at 03:50:09 from (199.2.58.130):
In Reply to: Re: where is J D ???/ posted by Jon Hagen on March 27, 2011 at 22:11:44:
The coil with an internal resistor is a fable.There is no room in the coil case for a resistor.A 40 watt resistor is about 3 inchs long.The coil could not take the heat from the resistor.Since the coil is operating in an ac circuit we have to call it impedance.A 12 volt coil will need a change in wire size or turns of wire.A speaker with 8 ohms impedance will measure 3 to 4 ohms DC resistance.I retired from electronics at 65 and at 73 much of the knowledge is fading away.I note that smart people can be very touchy and will explode when they are proven wrong.One fellow posted that he ran a tractor for 5 years with a dead alternator and didnt fix it until the bearings locked up and ruined the belt.I said that good mechanics wouldnt do this, I knew that he had done tv service work.You had to do good work on color sets.There was no room for shoddy work.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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