A transformer is connected to the 230 V mains supply. The primary coil has 2300 turns. The secondary coil has 120 turns.
What is the potential difference across the secondary coil?
4400 V4400\ \text{V}4400 V
120 V120\ \text{V}120 V
12 V12\ \text{V}12 V
1.2 V1.2\ \text{V}1.2 V
48 exam-style questions on OCR GCSE Physics 4.2 Uses of magnetism, covering 4.2.1 The motor effect, 4.2.2 Fleming's left-hand rule, 4.2.3 The force on a current-carrying conductor, 4.2.4 The electric motor, 4.2.5 Electromagnetic induction, 4.2.6 Alternators and dynamos, 4.2.7 How transformers work, 4.2.8 Transformer turns ratio, 4.2.9 Potential differences and turns in transformers, and 4.2.10 Microphones, loudspeakers and headphones. Each one has a worked solution and a mark scheme showing where the marks go.