How ballasts work and how they have changed from the 1940s. Magnetic ballasts to electronic ballasts used for fluorescent lamp fixtures. We look at the insides of the 'brick' ballasts of the 1940s, see the step-up transformer, chokes and capacitor. This video is part of the lighting project by the Edison Tech Center and the IEEE. It is an introduction to what ballasts are and a very general description of how they work. You can learn more about ballasts on the website: www.EdisonTechCenter.org/Fluorescent.html

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