Quoting Removed, click Modern View to seeYes, the resistors typically get very hot. Using the open (not encased) N tractor resistor (12250) connected to variable power supply, it is only warm at at an amp or two & resistance of a couple tenths of an Ohm, but increase that to 4 amperes & leave it powered for 1 to 2 minutes at 4A, & it becomes red (~800F) & will scorch paper touching it. Resistance goes up to over an Ohm.
Lower scope trace is current, upper is coil primary voltage.
To obtain ballast voltage, multiply current times value of resistor. Here, for example, the peak current was 3A & if the resistor was 1 Ohm, then the product would yield 3 Volt peak resistor voltage.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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