A transformer is used to convert 240 V240\text{ V}240 V a.c. to 12 V12\text{ V}12 V a.c. The primary coil has 500500500 turns.
Calculate the number of turns on the secondary coil.
Describe how an alternating current in the primary coil of a transformer induces an alternating voltage in the secondary coil.
State one mechanism by which energy is lost as heat in a transformer and identify the part of the transformer where this loss occurs.
An adapter is labelled:
State the electrical output of this adapter.
Name the electrical component that must be included in the adapter, in addition to a transformer, to produce this output.
A step-down substation transformer converts the transmission line voltage of 33 000 V33\,000\text{ V}33000 V a.c. to a distribution voltage of 11 000 V11\,000\text{ V}11000 V a.c. The current in the secondary coil is 15 A15\text{ A}15 A.
Assuming 100%100\%100% electrical efficiency, calculate the current in the primary coil.
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.