A 500 watt heating coil designed to operate from 110 volt


A 500 Watt heating coil designed to operate from 110 Volt is made of Nichrome wire 0.200 millimeter in diameter.

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

m

(b) Now consider the variation of resistivity with temperature. Find what power will the coil of part (a) actually deliver when it is heated to 1200°C?

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Physics: A 500 watt heating coil designed to operate from 110 volt
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