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Nichrome wire of cross-sectional radius 0.768 mm is to be used in winding a heating coil. If the coil must carry a current of 8.25 A when a voltage of 3.00 x 102 V is applied across its ends, find the following.
(a) the required resistance of the coil


(b) the length of wire you must use to wind the coil
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Added Mon, 20 Jul '15
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use ohm's law to find the resistance, R = 300/8.25

Then use the following to calculate the length.
Resistance of a wire in ?
R = ?L/A
? is resistivity of the material in ?-m
L is length in meters
A is cross-sectional area in m?
A = ?r?, r is radius of wire in m
resistivity Cu 17.2e-9 ?-m
resistivity Nichrome 150e-8 ?-m

300/8.25 = (150e-8)L / (3.14*(0.000768)^2)
solve for L=44.89 m
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Added Mon, 20 Jul '15
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