Answer to Question #134799 in Electric Circuits for Sumayya

Question #134799
the copper track on a printed circuit board is made from copper foil 35um thick. the width of the track is 0.16cm and the resistivity of copper is 1.69x10^-8ohms. what is the resistance of 1cm of track?
1
Expert's answer
2020-09-24T16:05:58-0400

Resistance of wire(R) = ρlA\rho \frac{l}{A}

Here, ρ\rho is the resistivity of the wire

l is the length of the wire

A is the cross section area of wire

Given,

ρ\rho = 1.69 x 10-8 ohm m

l = 0.01 m

A = (1.6 x 10-3)(3.5 x 10-5)

= 5.6 x 10-8 m2

So,

R = (1.69 x 10-8)1065.6\frac{10^6}{5.6}

= 3.018 x 10-3 ohm


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