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No Slide Title
No Slide Title

... • Electromagnetic induction – The action caused when two electrically isolated coils are placed next to each other and an AC voltage is put across one coil, resulting in a changing magnetic field which induces a voltage into the second coil.. – The device used to create this action is called a tran ...
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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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