An engineer designs four different transformers. The number of turns on the primary and secondary coils for each transformer, along with their labels, are shown in the table.
| Number of turns on the primary coil (NpN_\text{p}Np) | Number of turns on the secondary coil (NsN_\text{s}Ns) | Type of transformer | |
|---|---|---|---|
| A | 80 | 80 | step-down |
| B | 120 | 40 | step-up |
| C | 50 | 250 | step-up |
| D | 240 | 120 | step-up |
Which row shows the correct label?
A
B
C
D
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.