Transformer calculator: turns ratio

Change the number of turns on each coil and the primary voltage to see the secondary voltage, and how the current changes the other way.

Learn transformers properly

StudyAI writes clear notes on any topic you study, with practice quizzes, past-paper questions explained, and interactive models like this one in the notes.

Get free notes and a quiz on this
Free to start. No card needed.

Questions students ask

What is the transformer equation?

Vs/Vp = Ns/Np. In an ideal transformer VpIp = VsIs.

Why do transformers only work with a.c.?

A changing current makes a changing magnetic field in the core, which induces the secondary voltage. A steady d.c. induces nothing.

Free notes on transformers

More physics tools

Projectile motion simulator
Set the launch speed, angle and height and see the trajectory, range, maximum height and time of flight. Metri…
Velocity–time graph: acceleration and distance
Build a velocity-time graph and get the acceleration from the slope and the distance from the area. Metric or …
Simple pendulum simulator
Change the length, amplitude and planet and see the period of a pendulum, solved exactly for large swings.
Lens ray diagram simulator
Draw ray diagrams for converging and diverging lenses: image position, real or virtual, magnification. Uses 1/…
All interactive tools
Use this on your own site or class page

Copy this code. It is free to use, as long as the link stays.