IB Physics: Solutions

1. The diagram shows a section of the distribution network from a power station. The distance from the power station to the town is 20km. The cables used are made of aluminium and have a cross sectional area of 100mm2. How many cables would have to be used in parallel to reach an acceptable power loss of 2.5% when delivering 2GW of power Resistivity of Al = 28.2 x 10-9 Ωm Solution

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