Voltage equals apparent power divided by current. This relationship is fundamental to all electrical circuit analysis.
V = VA ÷ A. Voltage is apparent power divided by current.
Know VA and load current to verify the operating voltage is correct.
Circuit analysis, UPS verification, power supply design, load matching.
VA = Volts × Amps. Rearranging gives V = VA ÷ Amps.
Derive voltage from apparent power and current.
VA is apparent power in volt-amps, Amps is current. Result is voltage in volts.
2 simple steps.
Find the VA rating and current draw from equipment specs.
V = VA ÷ Amps. Example: 1000 VA ÷ 5 A = 200 V.
Check that the result matches your system voltage (120V, 230V, etc.).
Voltage at various VA and current combinations.
| VA | 1 A | 2 A | 5 A | 10 A | 20 A |
|---|---|---|---|---|---|
| 100 | 100 | 50 | 20 | 10 | 5 |
| 500 | 500 | 250 | 100 | 50 | 25 |
| 1000 | 1,000 | 500 | 200 | 100 | 50 |
| 2000 | 2,000 | 1,000 | 400 | 200 | 100 |
| 5000 | 5,000 | 2,500 | 1,000 | 500 | 250 |
Practical voltage calculations.
650 VA UPS drawing 2.7 A:
650 ÷ 2.7 = 240 V
500 VA at 4.2 A:
500 ÷ 4.2 = 119 V
5000 VA at 12 A:
5000 ÷ 12 = 417 V
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Common questions about VA to volts conversion.
VA = Volts × Amps. So Volts = VA ÷ Amps, and Amps = VA ÷ Volts.
Not in AC circuits. VA is apparent power, Watts is real power. They are equal only when PF = 1.0.
For DC: V = W ÷ A. For AC: you need VA (apparent power), not watts, because of power factor.
UPS units are rated in VA because they must handle apparent power, which includes reactive components.
It depends on the current. At 4.35A it produces 230V. The VA rating tells you capacity, not voltage.