// multi-utility computation suite · offline · instant · precise
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eng.transformer-turns-ratio Calculator
Calculates transformer turns ratio, voltage ratio, and current ratio for an ideal transformer from winding data. The turns ratio exactly determines the voltage transformation — nameplate voltage ratio equals turns ratio for an ideal transformer.
Inputs
V Primary
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
V Secondary
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
I Secondary
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Results
turns ratio (Np:Ns)
The proportional relationship between two quantities.
primary current (A)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
apparent power (VA)
Sample size or count used in the calculation.
step up or down?
Sample size or count used in the calculation.
Np/Ns = Vp/Vs = Is/Ip
Sample size or count used in the calculation.
efficiency loss
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.