Which of the following transformers can change a 240 V a.c. input into a 12 V a.c. output?
Primary coil of 600 turns600\text{ turns}600 turns, secondary coil of 30 turns30\text{ turns}30 turns
Primary coil of 800 turns800\text{ turns}800 turns, secondary coil of 50 turns50\text{ turns}50 turns
Primary coil of 1000 turns1000\text{ turns}1000 turns, secondary coil of 40 turns40\text{ turns}40 turns
Primary coil of 1200 turns1200\text{ turns}1200 turns, secondary coil of 80 turns80\text{ turns}80 turns
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.