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Re: Re: Re: Re: Re: Re: Confused on coil
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Posted by JHEnt on December 07, 1999 at 16:46:03 from (216.138.56.166):
In Reply to: Re: Re: Re: Re: Re: Confused on coil posted by MrG: on December 07, 1999 at 10:14:27:
The high side of a 12 volt coil will produce between 20,000 and 40,000 volt depending on the windings in the coil. I belive most common tractor coils run near 20,000 volts. Your battery voltage enters on one post of the coil. When the points are closed (connecting to ground) the current flows through the low side of the coil to ground. This produces a magnetic field inside the coil. When the points open it disconnects this circuit. At this point the magnetic field begins to collapse. The battery voltage is still pushing (voltage is pressure) on both the high and low side. The collapsing magnetic field allows a current flow out the high side of the coil. Due to the ratio of windings the collasping magnetic field pushs enough out to jump the gap at the spark plug.
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