Transformer Calculator for Electrician Study

Transformer questions often combine kVA, primary and secondary voltage, current, phase, and turns ratio. Our transformer calculator helps you practise those relationships with visible formulas and worked substitutions instead of treating the result as a black box.

Calculated full-load current is an electrical-theory result. Code-required conductor and overcurrent-protection selections still require the applicable CEC rules, tables, conditions, and equipment information.

• Single-phase current: I = kVA × 1000 ÷ V.
• Three-phase current: I = kVA × 1000 ÷ (√3 × VLL).
• Ideal transformer voltage ratio: Vs ÷ Vp = Ns ÷ Np.
• Practise primary and secondary current, kVA, voltage, and turns-ratio relationships.