a copper wire of length 1km when connected to 200v power supply draws a current of 2A. if the resistivity of material is 1.72ohm.calculate cross sectional area of wire
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Answer:
Explanation:
V = IR
V = 200
I = 2A
R = 200/2
100
R = r*l/a
R = 100
r = 1.72
L = 1000m
100 = 1.72*1000/a
100 = 1720/a
100a = 1720
a = 1720/100
a = 17.2 m^2
Hope you understand
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