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Using and making transformers - School
Using and making transformers - School

... 2. The core is made of ‘soft’ iron. It is easily magnetised by the effect of a current in a coil around it but loses that magnetism immediately the current is switched off. 3. The primary coil is supplied by an ALTERNATING voltage so its magnetism changes very rapidly. 4. The magnetism passes throug ...
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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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