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TAP 414- 6: Quick demonstrations of electromagnetic induction
TAP 414- 6: Quick demonstrations of electromagnetic induction

... Suspend a magnet from a spring so that it hangs within a coil connected to an oscilloscope. Displace the magnet and allow it to bob up and down. The resulting induced voltage can be studied. Notice the direction of the induced voltage compared with the direction of motion of the magnet. Ask the stud ...
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... AC voltmeters and ammeters show the RMS value of the voltage or current. DC meters also show the RMS value when connected to varying DC providing the DC is varying quickly, if the frequency is less than about 10Hz you will see the meter reading fluctuating instead. What does '6V AC' really mean, is ...
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... different kinds of transistors, one n-p-n type and the other p-n-p type. The switching speeds of np-n and p-n-p transistors are widely different unless they are produced carefully as matched pairs. In power electronic applications, n-p-n transistors are preferred as they can operate at higher switch ...
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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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