College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 13

Nichrome wire of cross-sectional radius 0.791 mm is to be used in winding a heating coil. If the coil must carry a current of 9.25 A when a voltage of 1.20 × 10 2 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