Transformer Calculator

Calculates transformer parameters based on the relationship between primary and secondary windings. Voltage ratio equals turns ratio, while current ratio is inverse.

1. 1

   Step 1

   Enter primary and secondary voltages

2. 2

   Step 2

   Or enter primary and secondary turns

3. 3

   Step 3

   Enter power rating and efficiency

4. 4

   Step 4

   View currents, losses, and ratios

• 1

  Turns ratio = voltage ratio for ideal transformers

• 2

  Current ratio is inverse of voltage ratio

• 3

  Efficiency = output power / input power × 100%

• 4

  VA rating must exceed connected load

• Confusing VA rating with watts (consider power factor)

• Forgetting transformer losses (core and copper)

• Not accounting for voltage drop under load

• Using DC with transformers (they only work with AC)