A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8...
A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8 Ω • m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 100 m apart?
Homework Answers
dia=1mm=1*10^-3m
p=1.68 × 10-8 Ω • m.
I=15 amp
d=100m
A=pie*(10^-30^2/4=7.85*10^-7 m^2
R=PL/A
=1.68 × 10-8 *100/7.85*10^-7
=2.14 ohm
V=IR
=15*2.14
=32V
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