During long-distance electrical energy transmission, step-up transformers are used to increase the voltage. Which statement correctly explains why transmitting electrical energy at a high voltage is more efficient?
The resistance of the transmission cables decreases as the voltage increases.
For the same transmitted electrical power, a higher voltage leads to a smaller current in the cables, reducing the energy lost as thermal energy.
A higher voltage results in a larger current in the transmission lines, which speeds up the energy transfer.
High voltage allows the electrical energy to be transmitted as direct current instead of alternating current.
136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.