edugen. ent Gradebook ORION Downloadable efextbook ent PRENTER VERSION Chapter 2

Question

edugen. ent Gradebook ORION Downloadable efextbook ent PRENTER VERSION Chapter 20, Problem 036 Review Conceptual Example Z as an aid in solving this problem. A portable electric heater uses 19.4 A of current. The manufacturer recommends that an estension cord attached to the heater receive no more than 2.49 W of power per metor of length. What is the smallest radius of copper ( An extension cord contains two wires.) resistivity 1.72 x 10 0-m) wire that can be used in the extension cord? (Note Number the tolerance is +/-2% Click if you would like to Show Work for this question: Qpen Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Poteetial Policy set by your instructor Question Attempts: 0 of 5 used SAVE FOR LATER SUBMET ANSWER Earn Maximum Points available ocly if you answer this question correctly in four attempts or less. 10150 ved. A Divison of 2hleSc en/shared/assignment/test/aglistuniTid rch

Explanation / Answer

here,

current , I = 19.4 A

power , P = 2.49 W

let the resistance be R

P = I^2 * R

2.49 = 19.4^2 * R

R = 6.62 * 10^-3 A

length , l = 2 m

let the radius be r

R = p * l /area

6.62 * 10^-3 = 1.72 * 10^-8 * 2/( pi * r^2)

r = 1.29 * 10^-3 m

the radius of wire is 1.29 * 10^-3 m

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