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The Challenge: Make an underwater flashlight

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.

Current through a battery and bulb