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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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