An electrical device changes the voltage of an alternating current (a.c.) supply from 110 V to 220 V.
What is this device?
a step-down transformer
a step-up transformer
an a.c. generator
a d.c. motor
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.