Question

Why are filaments of incandescent lamps made of tungsten wire?

Answer 1

Because tungsten has high melting point and it offers high resistence thus emmiting heat and light

Answer 2

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The melting point and resistivity of tungsten are very high. It does not burn very easy at a high temperature. The electric lamps glow at very high temperatures. Hence, tungsten is mainly used as heating element of electric bulbs.

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