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[Music] hi guys and welcome to completely electrical stem show this video is all about how fluorescent lights work how you calculate all of their parameters and also their power factor correction capacitor enjoy so heres the circuit diagram for a fluorescent light im going to be using whats known as the preheat method because the only ballast ive got is an old magnetic ballast nowadays you can get electronic ones that pretty much do everything for you corrects the power factor theyre glorious things actually and the tube goes there this is the starter switch which is essentially a bi-metallic strip and the way they work is um two pieces of different metal sandwiched together and when they heat up they expand at different rates so one of them will expand faster than the other one and move the contact out of position so its like an automatic switch this here is representing a um a ballast which is one of these just that coil of wire actually and the wire goes in there coils around