Electrical transformers and heavy machines are often rated in kVA (kilovolt-ampere). Today you'll learn the

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**formula to calculate amps from kVA.**

### Single Phase Circuits

Single phase amps are defined as multiple of 1000 times kVA divided by voltage.

Mathematically

Amps (1 φ) = [kVA * 1000] / E

**Example: Find the current drawn by a single phase 5 kVA circuit at a rated voltage of 400 volts.**

Solution: I = [5 * 1000] / 400 = 12.5 A

### Two Phase Circuits

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Three phase amps are defined as 1000 times kVA divided by 2 times system voltage.

Mathematically

Amps (2 φ) = [kVA * 1000] / [E * 2]

**Example: Find the current drawn by a two-phase 3 kVA circuit at a rated voltage of 230 V.**

Solution: I = [3 * 1000] / [230 * 2] = 6.52 A

**Example: Find the current drawn by a two-phase 3 kVA circuit at a rated voltage of 230 V.**

Solution: I = [3 * 1000] / [230 * 2] = 6.52 A

### Three Phase Circuits

Three phase amps are defined as 1000 times kVA divided by 1.73 times system voltage.

Mathematically

Amps (3 φ) = [kVA * 1000] / [E * 1.73]

**Example: Find the current drawn by a three phase 8 kVA circuit at a rated voltage of 480 volts.**

Solution: I = [8 * 1000] / [480 * 1.73] = 9.63 A

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