More cards in this set

Card 6

Front

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.

Back

Preview of the front of card 6

Card 7

Front

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.

Back

Preview of the front of card 7

Card 8

Front

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?

Back

Preview of the front of card 8