# Resistivity

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• Created by: hjdowning
• Created on: 21-01-19 12:01
If a coil of cable 50m in length has a conductor resistance of 0.275 Ohm, calculate the value for 800m of the same cable.
4.4 Ohm
1 of 8
Calculate the resistance of a single core copper cable 200m long and 25mm2 CSA. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.
0.138 Ohm
2 of 8
Determine the resistance of 150m of single copper cable whose CSA is 10mm2. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.
0.258 Ohm
3 of 8
Calculate the resistance of 75m of single aluminium cable whose CSA is 4mm2. Take the resistivity of aluminium to be 2.65 x 10-8 ohm/metre3.
0.5 Ohm
4 of 8
Find the CSA of a single copper cable 500m long, which carries a current of 2.5 amperes and has a volt drop of 3.58 volts. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.
6mm2
5 of 8
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.
0.645 Ohm
6 of 8
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.
224.0375 Volts
7 of 8
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?
2.5 times
8 of 8

## Other cards in this set

### Card 2

#### Front

Calculate the resistance of a single core copper cable 200m long and 25mm2 CSA. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.

0.138 Ohm

### Card 3

#### Front

Determine the resistance of 150m of single copper cable whose CSA is 10mm2. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.

#### Back ### Card 4

#### Front

Calculate the resistance of 75m of single aluminium cable whose CSA is 4mm2. Take the resistivity of aluminium to be 2.65 x 10-8 ohm/metre3.

#### Back ### Card 5

#### Front

Find the CSA of a single copper cable 500m long, which carries a current of 2.5 amperes and has a volt drop of 3.58 volts. Take the resistivity of copper to be 1.72 x 10-8 ohm/metre3.

#### Back 