A step-down transformer produces a 24 V a.c. output from a 240 V a.c. input.
There are 80 turns on the secondary coil.
How many turns are there on the primary coil?
888
808080
800800800
800080008000
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.