Transformers and Power Supplies
Transformer Current Calculator
Estimate secondary current with Transformer Current. The page keeps the formula, assumptions, and example values visible.
Enter values for secondary current
Use one consistent electrical operating case for all fields.
How Transformer Current works
The governing expression is Is = Ip × Vp/Vs. Transformer Current uses Primary current, Voltage ratio Vp/Vs to report Secondary current.
With the loaded values, secondary current evaluates to 20.00 A. Label alternate cases before adjusting an assumption.
Inputs for Transformer Current
Primary current and Voltage ratio Vp/Vs belong to Transformer Current. Keep source units with primary current.
Actual ratings and readings should replace the demonstration values.
- Primary current
- Example entry: 2 A.
- Voltage ratio Vp/Vs
- Example entry: 10.
Reading the Transformer Current result
This output represents Transformer Current.
Keep the calculated requirement separate from the rating ultimately selected.
Measurement and units
Check component ratings, isolation requirements, temperature, waveform, and manufacturer limits. Check prefixes on primary current.
A fair comparison keeps units, measurement point, and operating condition consistent.
Limits of this calculation
The ideal relationship excludes loss. For power-supply efficiency, use Power Supply Efficiency Calculator.
Additional electrical behavior needs its own measurement or calculation. Unentered effects remain outside Transformer Current.
A useful Transformer Current comparison
Record secondary current before testing a different primary current value.
Document the alternate primary current source.
Transformer Current record notes
Record source and operating details for primary current.
Retain raw secondary current beside its selected rating.