Single correct option
The heating element of an electric heater is made of nichrome mainly because it has
- A. high resistivity and high melting point
- B. low resistivity and low melting point
- C. high resistivity and low melting point
- D. low resistivity and high melting point
Show answer and solution
Answer: (A) high resistivity and high melting point
Heat produced is I^2Rt, so the element needs high resistivity. It also glows red hot without melting or oxidising quickly, so it needs a high melting point. Copper has low resistivity and would heat poorly.
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