   Chapter 17, Problem 15P

Chapter
Section
Textbook Problem

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 × 102 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.

(a)

To determine
The resistance of Nichrome wire.

Explanation

Given Info: Nichrome wire has cross sectional radius 0.791mm . The coil carries current 9.25A and the voltage across its ends is 1.20×102V

Explanation:

Equation to find resistance is,

R=VI

• R is the resistance of Nichrome wire,
• V is voltage across ends of coil ,
• I is the current through the coil,

Substitute 1.20×102V for V and 9

(b)

To determine
The length of Nichrome wire.

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