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Transformer Turns Ratio Calculator

Find output voltage or required turns for a transformer.

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Formula
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Formulas

V1/V2 = N1/N2 = I2/I1

Voltage ratio equals turns ratio. Current is inversely proportional.

Transformer Basics

Step-down: more primary turns. Step-up: more secondary turns. Ideal transformer: P_in = P_out. Real efficiency: 95-99% for power transformers. Used in power supplies, chargers, and grid distribution.