Transformers and Power Supplies
Transformer Turns Ratio Calculator
Use Transformer Turns Ratio Calculator to calculate secondary voltage from primary voltage and turns ratio Ns/Np. Keep the entered conditions with the answer so later comparisons are fair.
Run a Transformer Turns Ratio check
The defaults only show how Transformer Turns Ratio works; replace them with values for the actual equipment or period.
The Transformer Turns Ratio equation
The Secondary voltage value and any supporting metrics belong to this same Transformer Turns Ratio case, not to a nearby run with different inputs.
Read the Transformer Turns Ratio equation from the units on this page. A familiar symbol can shift meaning between DC, AC, energy, component, or billing work.
A clean Transformer Turns Ratio result confirms the arithmetic for secondary voltage; it does not prove the equipment rating or source data is the right one.
Sample Transformer Turns Ratio run
Using the sample values, Primary voltage = 230 V; Turns ratio Ns/Np = 0.104, the primary result is 23.92 V.
This Transformer Turns Ratio one-input test is a scale check, showing direction and sensitivity without turning the changed case into a recommendation.
If the changed primary voltage comes from a real measurement, keep the original Transformer Turns Ratio run so the source of the difference remains clear.
Source notes for Transformer Turns Ratio
Treat the Transformer Turns Ratio input panel like a short measurement log. If primary voltage is assumed rather than measured, label it before copying secondary voltage.
| Entry | Example | Check before use |
|---|---|---|
| Primary voltage | 230 V | Enter primary voltage in V. |
| Turns ratio Ns/Np | 0.104 | Enter turns ratio Ns/Np. |
What not to assume from Transformer Turns Ratio
Loaded secondary voltage also depends on regulation.
- Thermal resistance
- Ripple current
- Core saturation
When secondary voltage is close to a rating, use the stricter review path instead of relying on the extra decimals shown by Transformer Turns Ratio.
Reading secondary voltage
Read secondary voltage together with the input values, not as a standalone fact. The same number can imply different decisions under a different equipment rating or operating period.
Transformer Turns Ratio depends on topology, duty cycle, thermal path, ripple, and input voltage range.
Changing primary voltage while leaving turns ratio ns/np fixed is a useful way to see which assumption controls the answer.
If the next step shifts toward Flyback Transformer, keep that as a separate worksheet instead of forcing the numbers into Transformer Turns Ratio.
Audit trail for secondary voltage
Record topology, input range, output load, switching frequency, and thermal assumptions for Transformer Turns Ratio.
If a later Transformer Turns Ratio run changes only primary voltage, label it as sensitivity work. Several changed conditions deserve a new baseline.