A transformer has 400 turns on its primary coil and 8000 turns on its secondary coil.
Connected in this way, for what purpose could this transformer be used?
to convert a 240 V240\text{ V}240 V a.c. mains supply to operate a 12 V12\text{ V}12 V device
to convert a 12 V12\text{ V}12 V d.c. supply to operate a 240 V240\text{ V}240 V tool
to convert a 12 V12\text{ V}12 V a.c. supply to operate a 240 V240\text{ V}240 V device
to convert a 4800 V4800\text{ V}4800 V d.c. supply to a 240 V240\text{ V}240 V supply
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.