Step-by-step walkthrough
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
Step 1
Enter the primary (input side) voltage and its winding turns count.
Step 2
Enter the secondary (output side) turns count.
Step 3
Optionally enter primary current to see the corresponding secondary current an ideal transformer would deliver.
This assumes an ideal, lossless transformer. Real transformers lose a few percent of output voltage to winding resistance and core losses, and that gap grows as load current increases — check the datasheet's regulation spec for a realistic figure.
Only for a single primary-to-secondary pair. Run the calculation separately for each secondary winding, since each can have its own turns ratio relative to the primary.
