Voltage drop across ballest resistor
It does change and that is why its called a "ballast" (that's a very important word) instead of resistor........Re-read my post referring to the light bulb which is a good example, and in some "backyard" projects light bulbs are sometimes USED as a ballast
Some resistive materials (AKA light bulb) change resistance AS THEY HEAT. If you run more current through it, it heats up more and increases resistance. If you are attempting to regulate current, this means that as current tries to go up in a circuit, the ballast, "seeing" more current, HEATS UP, and INCREASES resistance, which tends to counteract the attempted increase in current. Exactly why the are called "ballast."
This is one example of a now vintage Amperite ballast tube. They are essentially a resistor in a tube, with special characteristics, and work somewhat like an ignition ballast. These do glow, dimly, when in operation in some circuits
Dope sheet on one particular Amperite. Buried, somewhere, are the engineering specs on Mopar ballasts similar in nature
It does change and that is why its called a "ballast" (that's a very important word) instead of resistor........Re-read my post referring to the light bulb which is a good example, and in some "backyard" projects light bulbs are sometimes USED as a ballast
Some resistive materials (AKA light bulb) change resistance AS THEY HEAT. If you run more current through it, it heats up more and increases resistance. If you are attempting to regulate current, this means that as current tries to go up in a circuit, the ballast, "seeing" more current, HEATS UP, and INCREASES resistance, which tends to counteract the attempted increase in current. Exactly why the are called "ballast."
This is one example of a now vintage Amperite ballast tube. They are essentially a resistor in a tube, with special characteristics, and work somewhat like an ignition ballast. These do glow, dimly, when in operation in some circuits
Dope sheet on one particular Amperite. Buried, somewhere, are the engineering specs on Mopar ballasts similar in nature
