Calculate the resistance of a 4mm2 CSA twin copper cable feeding a motor 150m away. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.
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Card 7
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A motor takes 45A from a 230v supply. A twin aluminium cable 40m in length feeds the motor, each core having a CSA of 16mm2. Calculate the voltage at the motor terminals. Take the resistivity of aluminium to be 2.65 x 10-8 ohm/metre3.
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Card 8
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Two cables have equal resistance but one has a CSA 2.5 times larger than the other. How much longer is the thicker cable than the thinner cable?