Electrical ballast | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-28

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electrical_ballast


00:00:40 1 Current limiting
00:01:43 2 Resistors
00:01:52 2.1 Fixed resistors
00:04:24 2.2 Self-variable resistors
00:06:12 3 Reactive ballasts
00:08:49 4 Electronic and magnetic ballasts
00:12:25 5 Fluorescent lamp ballasts
00:12:35 5.1 Preheating
00:14:30 5.2 Instant start
00:15:23 5.3 Rapid start
00:16:12 5.4 Dimmable ballast
00:16:48 5.5 Programmed start
00:17:31 5.6 Hybrid
00:18:03 6 ANSI Ballast factor
00:18:43 7 Ballast triode
00:19:05 8 See also



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SUMMARY
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An electrical ballast is a device placed in line with the load to limit the amount of current in an  electrical circuit. It may be a fixed or variable resistor.
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 a destructive level due to the negative differential resistance of the tube's voltage-current characteristic.
Ballasts vary greatly in complexity. They may be as simple as a resistor, inductor, or capacitor (or a combination of these) wired in series with the lamp; or as complex as the electronic ballasts used in compact fluorescent lamps and high-intensity discharge lamps.