// multi-utility computation suite · offline · instant · precise
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eng.transformer-turns Calculator
Calculates turns ratio, secondary voltage or current, and primary current from transformer winding data. The ideal transformer equation V₁/V₂ = N₁/N₂ assumes zero losses — real transformers have 98–99% efficiency at full load.
Inputs
Vp
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Vs
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Is
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Eta
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
turns ratio
The proportional relationship between two quantities.
primary current
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
output power
Reference formula or conversion factor shown for context.