The plug of a microwave oven contains a fuse. Explain the purpose of the fuse.
The internal power supply of the microwave oven includes a step-down transformer.
State the material used to make the core of this transformer.
The transformer operates with an input voltage of 230 V230\text{ V}230 V and an output voltage of 11.5 V11.5\text{ V}11.5 V. The primary (input) coil has 460460460 turns. Calculate the number of turns on the secondary (output) coil.
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.