Physics for IGCSE & O level - Magnets And Currents (Section 3 - No. 13)
If the primary coil has 100 turns and the secondary coil has 200 turns, is this a step-up or step-down transformer?
Step-up
Step-down
Neither
Cannot be determined.
Forklaring
Since the secondary coil has more turns than the primary, it is a step-up transformer.