Due to which of the following reasons copper and aluminium are not used for heating elements ?
Correct answer: D. All of the above
- A. Both have great tendency for oxidation
- B. Both have low melting point
- C. Very large length of wires will be required
- D. All of the above
Explanation
Copper and aluminium have low resistivity, so impractically long wires would be needed to obtain the resistance required for heating; they also have lower melting points and oxidation problems compared with heating alloys. Hence all the listed reasons are intended to apply.
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