Electricity is transmitted over long distances from power stations to consumers.
Which row in the table correctly describes the voltage and current used during transmission, and the primary reason for this choice?
| Transmission voltage and current | Reason | |
|---|---|---|
| A | High voltage and low current | To reduce energy loss |
| B | High voltage and high current | To reduce energy loss |
| C | Low voltage and high current | For safety |
| D | Low voltage and low current | For safety |
Row A
Row B
Row C
Row D
275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.