Vol. IV — Electronics · Tool

Turns ratio

Primary and secondary turns set the voltage and current split. Ideal transformer math, plus mutual inductance from L1, L2, and k.

Primary voltage Vp (volts) Primary turns Np Secondary turns Ns Primary current Ip (amps, optional)

Inductance L1 Unit

Inductance L2 Unit

Coupling k (0–1)

How it works

Ideal transformer: Vs / Vp = Ns / Np and Is / Ip = Np / Ns. The turns ratio a = Np / Ns steps voltage down (and current up) when a > 1.

Mutual inductance: M = k √(L1 L2), with |M| ≤ √(L1 L2) when 0 ≤ k ≤ 1. Perfect coupling is k = 1.