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Transformer Turns Ratio

Estimate secondary voltage from primary voltage and turns.

Safety first, always.

ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.

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Visual schematic

Transformer turns ratio

Changing current in the primary creates changing magnetic flux, inducing voltage in the secondary.

Low-voltage model

TP1: primary AC

TP2: isolated secondary

TP3: load voltage

Diagrams are simplified learning models for low-voltage electronics. They are not wiring instructions for mains, switchboards, fixed wiring, or legal electrical work.

Primary voltage

Primary turns

turns

Secondary turns

turns

Formula notes

Vs = Vp x Ns / Np

Transformer construction and mains isolation are specialist areas. Do not work on mains transformers live.

Visual formula bench

Transformer view

More secondary turns means higher ideal secondary voltage; fewer turns means lower voltage.

Live result

Check the inputs

1. Estimate

Load the example or enter a real low-voltage learning value.

2. Visualise

Use the diagram to connect the formula to current path, timing, frequency, or energy flow.

3. Verify safely

Build only suitable low-voltage circuits and confirm with a meter before scaling up.