An AC mains adapter for a household internet router contains a transformer.
Suggest a suitable material for the core of this transformer.
The transformer has an input voltage of 230 V230\text{ V}230 V and a target output voltage of 11.5 V11.5\text{ V}11.5 V. There are 400040004000 turns on the input (primary) coil. Calculate the number of turns required on the output (secondary) coil.
Identify which of the following conditions poses the greatest hazard of an electric shock when plugging in the adapter: dry hands, wet hands, cold environment, or dusty surface.
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.