Transformer Turns Ratio Calculator
How a transformer trades voltage for current.
For learning only, on an ideal transformer. Never open or wire 240V AC equipment yourself. Everything is worked out in your browser. Nothing is saved or sent anywhere.
1. Voltages
2. Turns and current
3. Results
How it was worked out
What this does and doesn't tell you
- Real transformers lose some power as heat, so the primary current is a little higher.
- 240V AC mains can kill. In Australia, work on household mains wiring must be carried out by a licensed electrician. Low-voltage DC systems can still deliver very high current.