A resistor adds a load to the circuit...which creates a voltage drop, and usually generates heat. A resistor of the proper value will drop the voltage coming into the coil from 12V to 6V.
A proper understanding of Ohm's Law and the relationship between resistance [R] in ohms, current [I] in amperes, and electromotive force [EMF, or E] in volts makes the concept simple. E=IxR...R=E/I....I=E/R... It's really not rocket science, but a lot of people tend to think of it that way.
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Today's Featured Article - Repairing A Massey Harris 22 - by John Reeves. I have just given this old girl (boy?) a replacement RH rear axle. I was lucky enough to find an axle in good shape at a reasonable price - also a replacement for the right rear brake assembly which was
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