The primary role of black tungsten wire in incandescent lamps is to serve as the light-emitting element. When electric current passes through the black tungsten wire, its high resistance converts electrical energy into heat, causing the wire to reach an incandescent state (approximately 2000–3000°C), thereby emitting visible light. Due to its high melting point (approximately 3422°C) and excellent thermal stability, black tungsten wire can operate at high temperatures for extended periods without melting or breaking, making it an ideal material for incandescent lamp filaments.
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