A 420-w heating coil designed to operate from 110 v is made, Ask an Expert

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A 420-W heating coil designed to operate from 110 V is made of Nichrome wire 0.520 mm in diameter. (Assume ? = 1.50 10-6 ? · m, and ? = 4.000 10-4(°C)^-1 for Nichrome.)

(a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used.

(b) Now consider the variation of resistivity with temperature. What power is delivered to the coil of part (a) when it is warmed to 1 200°C?

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