Incandescent Lamp

An incandescent lamp is one of the oldest and simplest types of electric lighting devices. It consists of a glass bulb that encloses a tungsten filament. When electrical current passes through the filament, it heats up to a high temperature and emits light. The bulb is filled with an inert gas, such as argon _______ ______ _____ _________ ____ _______ __________ _______ ____ __________ ___ ___.
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