The rating of a transformer is in kVA because _______.

The correct answer is option 4

Transformer

• A transformer is a static device that transfers energy from one circuit to another without a change in frequency.
• It is used to step up or step down the voltage and current level depending upon the turn ratio.
• The total losses in a transformer depend upon the copper and iron losses.
• Copper losses are due to transformer windings and depend on the flow of current (A) through them.
• Iron losses depend on the voltage (V).
• Therefore total losses are due to voltage (V) and current (A) and not to power factor.
• Thus Transformer ratings are expressed in kVA and not in kW.