Two high-voltage transmission lines span a distance of 260 km between Power Plant A and Town B, as shown in Figure 7. Power Plant A provides 350 MW of power. The potential difference at Power Plant A is 500 kV. The current in the transmission lines has a value of 700 A and the power loss in the transmission lines is 20 MW.
- Show, using calculations, that the total resistance of the two transmission lines is 41
. (2 marks)
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- Town B needs a minimum of 480 kV.
- Determine whether 480 kV will be available to Town B. Show your working. (3 marks)
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- Explain what would happen if the electricity between Power Plant A and Town B were to be transmitted at 50 kV instead of 500 kV. Assume that the resistance of the transmission lines is still 41
. (2 marks)
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