An offshore tidal-stream turbine array generates electrical power that must be transmitted to an onshore coastal substation via a long subsea cable. Before transmission, a step-up transformer at the offshore platform increases the potential difference to 132 kV132\text{ kV}132 kV.
Explain how transmitting the electrical power at this high potential difference minimizes energy dissipation in the subsea cable.
28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid. Each one has a worked solution and a mark scheme showing where the marks go.