Calculate the resistance of a Nichrome wire 0.60 mm diameter and 1.30 m long. The resistivity of Nichrome is 100 x 10-8 Ω-m

Question

 Calculate the resistance of a Nichrome wire 0.60 mm diameter and 1.30 m long. The resistivity of Nichrome is 100 x 10-8 Ω-m 

 

Answer 1

R = (pl)/A

A is cross sectional area.

area = pi r^2

A = pi(.30mm^2) x 1 m / 1000 mm x 1m/1000mm = .09 x 10^-6 = 9 x 10^-8m^2

R = [(100 x 10-8 Ω-m )(1.30 m )]/ 9 x 10^-8m^2

Solve this. Get answer in Ohms