# A single-phase transformer with a 2-kVA rating has a 480-V primary and a 120-V secondary. Determine the primary and secondary full-load currents of the transformer.

A single-phase transformer with a 2-kVA rating has a 480-V primary and a 120-V secondary. Determine the primary and secondary full-load currents of the transformer.

### Right Answer is:

4.17 A and 16.67 A

#### SOLUTION

This is a single-phase transformer rated in kilovolt-amperes; therefore, the equation used to determine the full-load current for both windings is

**Primary full-load current = (kVA rating × 1000) / Primary Voltage**

The full-load current of the primary winding of the transformer is 4.17 amperes, and for the secondary winding, the full-load current is 16.67 amperes.

Primary full-load current = ( 2 kVA × 1000 ) / 480 V =** 4.17 A**

Secondary full-load current = VA rating / Secondary Voltage

Secondary full-load current = ( 2 kVA × 1000 ) / 120 V = **16.67 A**