§ — Locked · Electrician
Unlock Transformer ratio
Voltage, current, and transformation ratio
The classic ideal transformer relationship U₁/U₂ = N₁/N₂ = I₂/I₁. Enter the primary voltage and turns ratio — the secondary voltage and current ratio are calculated live. Assumes an ideal transformer without losses; real transformers have ≤ 99.5 % efficiency (add 0.5–3 % for precise current sizing).
See all calculators in the trade — free and without an account.
Members only
Transformer ratio is locked
Create a free user account to unlock all articles, calculators, templates and range — and get access to quizzes and classes. It takes less than a minute: name, email and a password. No payment card.
You will come back here afterwards
Want to try something first? See what you can use without an account — the junior zone, the encyclopedia, the videos and more.