Posted by rvirgil_KS on August 17, 2023 at 07:49:32 from (8.36.244.33):
In Reply to: 12 volt conversion posted by tomturkey on August 16, 2023 at 14:30:48:
Here is a diagram that may help you better understand the question.
The points and the coil do not care if circuit is fed from a 6 or 12 volt battery. The points and coil want a near constant AMPS (usually about 4 amps).
Ohms law states that the current equals voltage divided by resistance.
6 volt coils are about 1 1/2 ohm resistance across primary, direct 12 /volt no resistor required coils are about 3 ohms.
In a 6 volt system 6 volts divided by 1 1/2 ohms equals 4 amps.
If you double the voltage to 12 volts you will need to double the resistance to 3 ohms to maintain the 4 amps. This can be done by adding a 1 1/2 ohm resistor or changing to a 3 ohm coil.
These voltage, current, and resistance values are nominal and will vary slightly in real life.
The 3 ohm direct 12 volt coil has the internal resistance determined by type of wire and number of turns in the coil. It does not have a separate resistor in series with the winding inside the coil can.
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