Electrical resistor bars are made of _______________?
Correct answer: A. Silicon carbide
- A. Silicon carbide
- B. Alumina
- C. Zirconia
- D. Graphite
Explanation
Silicon carbide is electrically conductive and retains strength at high temperature, making it suitable for resistance-heating bars and elements. Alumina and zirconia are generally electrical insulators, while graphite has different oxidation limitations.
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