MCQ
Coils of heating devices are made up of:
- AMercury
- ✓Nichrome
- CCopper
- DTungsten
✓
Answer
Correct option: B.
Nichrome
Most heating elements use Nichrome $ \frac{80}{20}$ $(80\%$ nickel, $20\%$ chromium$)$ wire, ribbon, or strip.
Nichrome $ \frac{80}{20}$ is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.
Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.Hence, nichrome is used as heating elements.
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