A portion of Nichrome wire of radius 3.70 mm is to be used in winding a heating

Question

                 A portion of Nichrome wire of radius 3.70 mm is to be used in winding a heating coil. If the coil must draw a current of 8.30 A when a voltage of 120 V is applied across its ends, find the following. (Take the resistivity of nichrome to be

A portion of Nichrome wire of radius 3.70 mm is to be used in winding a heating coil. If the coil must draw a current of 8.30 A when a voltage of 120 V is applied across its ends, find the following. (Take the resistivity of nichrome to be 1.50 10-6 ? · m.) the required resistance of the coil ? the length of wire you must use to wind the coil m

Explanation / Answer

a) resistance - V/I = 120/8.3 = 14.45783 ohms

b) length = (R/r)*A = (14.45783*1.5*10^-6)*3.14*(3.7*10^-3)^2 = 414.3286367186666 m

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