Describe when a light bulb is turned on, the electric current in the filament causes the filament to become hot and glow. If the filament is surrounded by gas, describe how thermal energy is transferred from the filament to the air outside the bulb.

Question

14-03-2016
Physics

Answered

Describe when a light bulb is turned on, the electric current in the filament causes the filament to become hot and glow. If the filament is surrounded by gas, describe how thermal energy is transferred from the filament to the air outside the bulb.

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Hagrid Hagrid · Answer 1 · 2016-03-18T09:31:15-04:00

Electric
current passes through a filament of an incandescent bulb, thereby increasing
it temperature. When current flows, it contains electrons through the filament
to produce light. Typically, incandescent light bulb consists of a glass enclosure
that contains tungsten filament. The glass enclosure contains either a vacuum
or an inert gas that serves as the filament protection from evaporating.
Incandescent light bulbs contain a stem attached at to its base to allow the
electrical contacts to run through the envelope without gas or air leaks.