Why is electrical energy transmitted over long-distance power grids at a high voltage rather than a low voltage?
To decrease the electrical resistance of the transmission cables.
To increase the speed at which the electrical energy travels.
To reduce the energy lost as thermal energy in the cables.
To make the overhead cables safer for the general public.
69 exam-style questions on CIE IGCSE Physics 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.