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Re: calling electrical engineers...

To: "Spridgets" <spridgets@autox.team.net>
Subject: Re: calling electrical engineers...
From: "David Lieb" <dbl@chicagolandmgclub.com>
Date: Sun, 9 Jul 2006 21:02:55 -0500
>> It will probably overheat and burn up, as it will be dissapating FOUR
>> TIMES as much power as it was designed for.  Power = Current X
>> Voltage.  Current = Voltage / Resistance.  So Voltage X Voltage /
>> Resistance = Power.  Ok so your six volt coil is probably about 1.5
>> Ohms.  And designed to run at 6 volts.  It was intended to dissapate a
>> modest 24 watts.  If you up the voltage, without doing anything else,
>> the coil will be running at 96 watts.   Not good.  So if you want to
>> run a 6v coil, you need a ballast resistor that is about equal to the
>> resistance of your coil.


Makes a great theory, but in practise, as Paul A observed, the coil on a 12V 
system is actually running at about 9V. If you were old enough to remember 
people converting their 6V vehicles to 12V, you would remember that 
generally the opnly thing they did was to change the battery and the 
regulator. There was no market for 6V bulbs, starters, etc, so you ran them 
on 12V until they died and then changed the dead bulb. Amazing how long a 6V 
starter will run on 12V! 




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