Calculate secondary voltage from primary voltage and turns ratio
Primary voltage Vp (V)
Primary turns Np
Secondary turns Ns
Result
Answer
Step-by-Step Derivation
Transformer Turns Ratio Formula
Vp / Vs = Np / Ns
Vs = Vp x Ns / Np
An ideal transformer voltage ratio follows the coil turns ratio. More secondary turns create a step-up voltage, while fewer secondary turns create a step-down voltage.
⚠This calculator assumes an ideal transformer. Real transformers have losses, regulation limits, current ratings, frequency limits, and insulation requirements.
How Transformer Turns Ratio Works
A transformer transfers AC energy through magnetic coupling. The ratio of coil turns determines the ratio of primary and secondary voltages in the ideal model.
Turns Ratio
Voltage follows Ns divided by Np.
Step-Up
More secondary turns increase voltage.
Step-Down
Fewer secondary turns reduce voltage.
Ideal Model
Real designs must include losses and ratings.
Example: For Vp = 120 V, Np = 600, and Ns = 120, Vs = 120 x 120 / 600 = 24 V.
Applications of Transformer Turns Ratio
Power SuppliesAC ConversionIsolation TransformersElectronics EducationTransformer Design
Frequently Asked Questions
What is a transformer turns ratio calculator?▼
It calculates secondary voltage from primary voltage and the ratio of secondary turns to primary turns.
What is the transformer turns ratio formula?▼
Vp/Vs = Np/Ns, so Vs = Vp x Ns/Np for an ideal transformer.
How do I use this transformer voltage calculator?▼
Enter primary voltage, primary turns, and secondary turns. The tool calculates secondary voltage and ratio.
What is a step-up transformer?▼
A step-up transformer has more secondary turns than primary turns, so secondary voltage is higher.
Where is turns ratio calculation used?▼
It is used in transformer design, power supplies, AC conversion, isolation transformers, and electronics education.
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