(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A portion of Nichrome wire of radius 2.50 mm is to be used

in winding a heating coil. If the coil must draw a current of

9.25 A when a voltage of 120 V is applied across its ends,

find (a) the required resistance of the coil and (b) the

length of wire you must use to wind the coil.

2. Relevant equations

RI = V

R = I/oA

3. The attempt at a solution

(a) RI = V

R = V/I = 120V/9.25A = 12.973Ohms

(b)

R = l/oA

l = RoA = (12.973Ohms)(.000001ohms*m)(.0025m*3.14*2) = 2.036761e-7m

The answer to the second part of the equation is 255m and I can't figure out what I did wrong...

Thanks!

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# Homework Help: Heating coil wire resistance and length of wire required

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