College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 53

A particular wire has a resistivity of 3.0 × 10 8 V · m and a cross-sectional area of 4.0 × 10 6 m 2. A length of this wire is to be used as a resistor that will develop 48 W of power when connected across a 20-V battery. What length of wire is required