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We decided to
use a light
bulb as the basis for our underwater flashlight.
The concept
of the light bulb is quite simple. An electric current flows through
the filament
from the source.
The filament emits energy in the form of visible light and heat.
The glass bulb helps to protect the wire and enables it to be surrounded
with a gas other than air and/or a partial vacuum. Changing the
gas around the filament can serve to make it last longer. So, in
essence, a light bulb is simply a small metal wire that is glowing
with heat.
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