Question

What is inside the glass case of the bulb? ​

Answer 1

The wires, stem and the filament are inside a glass bulb, which is filled with inert gas, such as argon.


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Answer 2

• A tungsten wire filament transmits electricity and is enclosed in an airtight glass case (the envelope, or bulb).
• Contact wires and a base with two (or more) conductors link the filament to the electrical system.
• A stem or glass mount is typically attached to the base of incandescent light bulbs, allowing the electrical connections to flow through the envelope without losing air or gas.
• Little wires embedded in the stem keep the filament and lead wires in place.