Question

calculate the resistance of 1km long copper wire radius 1mm​

Answer 1

Answer:

2

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Answer 2

Answer: 5.474 Ohms

Step-by-step explanation:

Resistance = (Resistivity of material × Length)/ Cross sectional Area wire

Resistivity of Copper =20°C is 1.72 x 10^-8

Length of wire - 1km = 1000 meters

Radius of wire - 1mm

Area of wire - π x r ^2 = 3.14 × 10^-6 sqm

Hence

Resistance- [(1.72×10^-6)× 1000m]/(3.14×10^-6)sq.m

= 5.474 Ohms