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A 230-W heating coil designed to operate from 110 V is made of Nichrome wire 0.560 mm in diameter. (Assume ρ = 1.50 10-6 Ω • 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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