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[1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
In the 1970s, 34-watt energy-saving F40T12 fluorescent lamps were intoroduced in the United States. In the 1980s, T8 32-watt lamps were introduced, [8] but unlike the T8 tubes introduced in Europe, these T8s are not retrofits and require new matching ballasts to drive them. These ballasts were originally magnetic, but most today are electronic.
Three teenagers have been arrested after a man was chased and stabbed in the back. Hertfordshire Police said the 23-year-old was taken to hospital for treatment after an altercation at about 13:20 ...
Feb 9, 2025; New Orleans, LA, USA; Philadelphia Eagles quarterback Jalen Hurts (1) hoists the Vince Lombardi Trophy after defeating the Kansas City Chiefs in Super Bowl LIX at Ceasars Superdome.
Elkins' early January disappearance sparked massive online and on-the-ground searches by friends and family. A GoFundMe set up to assist with costs for her two sons garnered over $13,000.. At a ...
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