kVA to Amp Calculator
Convert apparent power in kilovolt-amperes (kVA) to current in amperes (Amps).
Kilovolt-Ampere to Ampere Converter
Common kVA to Amp Conversions
Click on these links to see instant conversions with common values:
Understanding kVA to Amp Conversion
Converting kilovolt-amperes (kVA) to amperes (Amps) involves understanding the relationship between apparent power, voltage, and the type of electrical system (single-phase or three-phase).
Conversion Formulas
Amps (I) = (kVA × 1000) / Volts (V)
For Three-Phase:
Amps (I) = (kVA × 1000) / (√3 × Volts (V))
Where:
• kVA = Apparent Power in Kilovolt-Amperes
• V = Voltage in Volts
• I = Current in Amperes
• √3 ≈ 1.732
Key Concepts
- Kilovolt-Ampere (kVA): The unit of apparent power, which is the total power flowing in an AC circuit. It is the product of voltage and current, and is used for sizing electrical equipment like transformers and generators.
- Ampere (A): The unit of electric current, representing the flow of electric charge.
- Volt (V): The unit of electric potential difference.
- Single-Phase Power: Electrical power delivered by a system where all the voltages of the supply vary in unison.
- Three-Phase Power: Electrical power delivered by a system where three alternating currents are out of phase with each other by 120 electrical degrees. It is more efficient for transmitting large amounts of power.
Typical kVA Ratings and Corresponding Amperage
| Application | kVA | Voltage (V) | Phase | Approx. Current (A) |
|---|---|---|---|---|
| Small Generator | 5 | 120 | Single | 41.67 |
| Commercial UPS | 20 | 208 | Three | 55.5 |
| Industrial Transformer | 100 | 480 | Three | 120.28 |
| Residential Service | 25 | 240 | Single | 104.17 |
Frequently Asked Questions
What is the difference between kVA and kW?
kVA (kilovolt-amperes) is apparent power, the total power in a circuit. kW (kilowatts) is real power, the power that actually does work. The difference is due to reactive power, which is present in AC circuits with inductive or capacitive loads.
Why is it important to know kVA?
kVA is important for sizing electrical equipment like transformers, generators, and UPS systems. These devices are rated in kVA because they must handle the total apparent power, not just the real power, to avoid overheating and damage.