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applications of cathode ray tubes i

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... Fig. 1 is the circuit model for the experiment. SW1 is a switch that is used to energize the system. When closed it provides 7.2 kV RMS to the insulators being tested. R and jX represent the resistance and reactance of the distribution line feeding the circuit. These components can be neglected beca ...
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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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