If the resistivity of a material is 10 ohm metre, length is 5 m and area of cross section is 2 m^2. Calculate its resistance.
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CALCULATION OF CABLE RESISTANCE
Hence R = 22.5/10 = 2.25 Ohms per km.
Length of conductor = 500m =500/1000 = 0.5km.
Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium, The resistance per km for Aluminium is given by:
R = 36/S(c.s.a)
Again S = 10mmsq.
Hence R = 36/10 = 3.6 Ohms per km.
Length of conductor = 0.5km.
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