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Why is tungsten used almost exclusively for the filament of incandescent electric lamps?

1. It has a low melting point and high resistivity
2. It has a high melting point and high resistivity
3. It is a very good conductor of heat
4. It does not oxidize at high temperatures

Correct answer: It has a high melting point and high resistivity

Solution

Tungsten is used because it can withstand very high temperatures without melting, and its relatively high resistivity helps it heat up and glow. These properties make it ideal for incandescent lamp filaments.

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