VA to Amps Calculator
Convert apparent power in volt-amperes (VA) to current in amperes (Amps).
Volt-Ampere to Ampere Converter
Common VA to Amps Conversions
Click on these links to see instant conversions with common values:
Understanding VA to Amps Conversion
Converting volt-amperes (VA) 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) = VA / Volts (V)
For Three-Phase:
Amps (I) = VA / (√3 × Volts (V))
Where:
• VA = Apparent Power in Volt-Amperes
• V = Voltage in Volts
• I = Current in Amperes
• √3 ≈ 1.732
Key Concepts
- Volt-Ampere (VA): 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 UPS systems.
- 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 VA Ratings and Corresponding Amperage
| Application | VA | Voltage (V) | Phase | Approx. Current (A) |
|---|---|---|---|---|
| Small UPS | 500 | 120 | Single | 4.17 |
| Desktop PC | 300 | 120 | Single | 2.5 |
| Server Rack | 3000 | 208 | Three | 8.33 |
| Small Generator | 5000 | 240 | Single | 20.83 |
Frequently Asked Questions
What is the difference between VA and Watts?
VA (volt-amperes) is apparent power, the total power supplied to a circuit. Watts (W) 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. For purely resistive loads, VA and Watts are equal.
Why is it important to know VA?
VA is important for sizing electrical equipment like transformers, UPS systems, and generators. These devices are rated in VA because they must handle the total apparent power, not just the real power, to avoid overheating and damage.