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Ideal transformer calculator

Calculate the secondary voltage and corresponding primary current from the turns counts and secondary load.

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01

Your inputs

The starting values are an example.

Decimals: 12.5 · Thousands: 1,234.56. Follow the field instructions for lists.

02

Your result

Enter your values and select Calculate.

Your calculation will appear here.

Your result will include the relevant values and units.

Understand the calculation

Formula and example

How it is calculated

U₂/U₁ = N₂/N₁; I₁/I₂ = N₂/N₁

Worked example

A turns ratio of 1,000 to 100 ideally converts 24 V to 2.4 V. A secondary current of 2 A corresponds to a primary current of 0.2 A.

Things to check

  • The model describes AC voltage. A transformer requires a magnetic flux that changes over time.
  • Power is conserved in the ideal model. Core losses, copper losses and no-load current are excluded.