A transformer with 100 turns on each coil is connected to a 12 V battery instead of a 12 V alternating supply. What is the potential difference across the secondary coil?
0 V, because the magnetic field in the iron core does not change
0 V, because a battery cannot drive a current through a wire coil
12 V, because the turns ratio of this transformer is 1 to 1
12 V, because the iron core carries the field to the secondary coil
40 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.