A transformer has 8000 turns on its primary coil and 400 turns on its secondary coil. Connected in this way, for what purpose could this transformer be used?
to convert the 11 000 V11\,000\text{ V}11000 V a.c. output of a power station to 220 000 V220\,000\text{ V}220000 V for long-distance power transmission
to convert the 220 000 V220\,000\text{ V}220000 V d.c. supply from a transmission line to 11 000 V11\,000\text{ V}11000 V for local distribution
to use a 12 V12\text{ V}12 V d.c. supply to operate a 240 V240\text{ V}240 V travel iron
to use a 240 V240\text{ V}240 V a.c. mains supply to operate a 12 V12\text{ V}12 V halogen bulb
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.