Asked by  | 26th Jul, 2008, 09:05: PM

Expert Answer:

Because when an electric charge is passed through the tungsten filament it glows instantaneously. When you turn on a fluorescent tube, the starter is a closed switch. The filaments at the ends of the tube are heated by electricity, and they create a cloud of electrons inside the tube. The fluorescent starter is a time-delay switch that opens after a second or two. When it opens, the voltage across the tube allows a stream of electrons to flow across the tube and ionize the mercury vapor.

Answered by  | 27th Jul, 2008, 08:50: AM

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