Amp to kVA Calculator
Convert current in amperes (Amps) to apparent power in kilovolt-amperes (kVA).
Ampere to Kilovolt-Ampere Converter
Common Amp to kVA Conversions
Click on these links to see instant conversions with common values:
Understanding Amp to kVA Conversion
Converting amperes (Amps) to kilovolt-amperes (kVA) involves understanding the relationship between current, voltage, and the type of electrical system (single-phase or three-phase).
Conversion Formulas
kVA = (Amps (I) × Volts (V)) / 1000
For Three-Phase:
kVA = (√3 × Amps (I) × Volts (V)) / 1000
Where:
• I = Current in Amperes
• V = Voltage in Volts
• kVA = Apparent Power in Kilovolt-Amperes
• √3 ≈ 1.732
Key Concepts
- Ampere (A): The unit of electric current, representing the flow of electric charge.
- Volt (V): The unit of electric potential difference.
- 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.
- 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 Current and Voltage Ratings for kVA
| Application | Voltage (V) | Current (A) | Phase | Approx. kVA |
|---|---|---|---|---|
| Small UPS | 120 | 8.33 | Single | 1 |
| Residential Service | 240 | 100 | Single | 24 |
| Small Commercial Building | 208 | 200 | Three | 72.1 |
| Medium Industrial Load | 480 | 300 | Three | 249.4 |
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.