A step-up transformer at a power station is used to prepare electricity for long-distance transmission.
The transformer increases the generator's output voltage from 18 kV18\text{ kV}18 kV to a transmission voltage of 132 kV132\text{ kV}132 kV. The primary coil of this transformer has 600600600 turns.
Calculate the number of turns on the secondary coil.
Explain the advantages of transmitting electricity at high voltages such as 132 kV132\text{ kV}132 kV.
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.