An ideal step-down transformer has a primary coil with 1800 turns and a secondary coil with 90 turns. The primary coil is connected to a 240 V AC supply. The secondary coil is connected to a resistor of resistance 4.0 Ω.
What is the current in the primary coil during operation?
0.15 A0.15\text{ A}0.15 A
3.0 A3.0\text{ A}3.0 A
60 A60\text{ A}60 A
1200 A1200\text{ A}1200 A
16 exam-style questions on OCR GCSE Physics Uses of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.