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2nd Order Circuits

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FLUKE Test Equipment

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... The stator current drops to zero when the unit trips; so, the rotor field current must increase to maintain the flux linking the rotor field winding. The initial voltage drop in the stator is from flux in the stator winding that did not link the rotor. If the field voltage is not changed, then the f ...
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Electrical ballast



An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.Ballasts vary in design complexity. They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.
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