A student is designing a low-voltage, high-current AC power supply for an electromagnetic launcher. They test four different ideal transformers, each connected to a standard mains supply. To protect the laboratory mains circuit, a fuse rated at 10 A is placed in the primary circuit of each transformer.
The table below shows the number of turns on the primary and secondary coils of the four transformers.
| Transformer | Number of turns on the primary coil (NpN_pNp) | Number of turns on the secondary coil (NsN_sNs) |
|---|---|---|
| P | 120 | 480 |
| Q | 540 | 60 |
| R | 450 | 90 |
| S | 250 | 250 |
Which transformer can deliver the largest output (secondary) current without blowing its primary fuse?
Transformer P
Transformer Q
Transformer R
Transformer S
34 exam-style questions on OCR A A Level Physics Electromagnetism, covering Magnetic fields, Motion of charged particles, and Electromagnetism. Each one has a worked solution and a mark scheme showing where the marks go.