A transformer has 200 turns on its primary coil and 1000 turns on its secondary coil.
State whether this is a step-up transformer or a step-down transformer.
Give a reason for your answer.
The potential difference across the primary coil is 12 V.
Use the equation: potential difference across primary coilpotential difference across secondary coil=number of turns in primary coilnumber of turns in secondary coil\dfrac{\text{potential difference across primary coil}}{\text{potential difference across secondary coil}} = \dfrac{\text{number of turns in primary coil}}{\text{number of turns in secondary coil}}potential difference across secondary coilpotential difference across primary coil=number of turns in secondary coilnumber of turns in primary coil
Calculate the potential difference across the secondary coil.
State the type of current that must be supplied to the primary coil for the transformer to work.
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.