Which statement about transformers is correct?
A transformer requires a direct current (d.c.) to operate.
The primary and secondary coils are electrically joined together.
A step-down transformer has fewer turns on its secondary coil than on its primary coil.
The iron core of a transformer is used to conduct electric current between the coils.
28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid, covering 13.2.1 Transformers and induction, 13.2.2 The transformer turns-ratio equation, 13.2.3 The National Grid, 13.2.4 The transformer power equation, and 13.2.5 Advantages of high-voltage transmission. Each one has a worked solution and a mark scheme showing where the marks go.