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| Amps to VA Calculator |
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How to calculate
Select the phase voltage source (AC- Single phase or AC -Three phase), Enter the current rating I in amps (A), Enter the voltage Rating V in volts (V), then click on " Calculate " button. VA to Amps Click on " swap " button.
Calculate Box
To convert between Amps (A) and Volt-amperes (VA) , you need to know the voltage rating and current rating . Use these formulas for quick conversions from amps to VA. Here are the formulas:
Amps to VA Formulas
- Single Phase :
For single phase systems, you can use the following formula:
\[
\text{S} = {\text{V} \times \text{I}}
\]
Example Calculation :- Let’s say we have a single phase transformer with current rating 10 Amps (A) and operates at 230 volts (V). The single phase apparent power is calculated as follows:
\[ \text{S} = \text{230}\text{ V}\times \text {10} \text{ A}= \text{2300} \text{ VA} \]Therefore, the apparent power in this single phase is 2300 VA.
- Three Phase: For three phase systems, the formula is slightly different due to the √3 (square root of 3) factor in three-phase power calculations. The formula is:
*For line to line voltage
\[ \text{S} ={\sqrt{3} \times \text{U} \times \text{I}} \]Example Calculation :- Let’s say we have a three phase transformer with a line current 16 Amps (A) and operates at 400 volts (V).
\[ \text{S} = \sqrt{3} \times \text{400}\text{ V} \times \text{16}\text{ A} = \text{11085.125} \text{ VA} \]Therefore, the apparent power in this single phase is 11085.125 VA.
*For line to neutral voltage
\[ \text{S} = \text{3} \times \text{V} \times \text{I} \]Example Calculation :- Let's say we have a three phase system with a line to neutral voltage of 230 V and phase current 4.35A. The apparent power is calculated as follows:
\[ \text{S} = \text{3} \times \text{230} \text{ V}\times \text{4.35}\text{ A} = \text{3001.5}\text{ VA} \]Therefore, the apparent power in this line to neutral is 3001.5 VA.
Unit of Measurement:
- \( U \): RMS Voltage in volt represents the L-L voltage.
- \( V \): RMS Voltage in volt (V) represents the L-N voltage.
- \( I \): RMS Current in amperes (A)
- \( √3 \): This factor (approximately 1.732) accounts for the relationship between line voltage and phase voltage in a three phase system. It ensures that the calculation correctly reflects the distribution of power among the three phases.
