kVA to Amps Calculator

Convert kVA to Amps

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How to Calculate Amps from kVA

Converting kilovolt-amperes (kVA) to amperes (amps) is a fundamental calculation in electrical engineering and power systems. It involves understanding the relationship between apparent power, voltage, and current. Our calculator simplifies this process, but it's important to understand the underlying principles.

Calculation Formula

The formula to calculate amps from kVA depends on whether the system is single-phase or three-phase:

For single-phase systems:

\[I = \frac{S}{V}\]

For three-phase systems:

\[I = \frac{S}{\sqrt{3} \cdot V}\]

Where:

  • I is the current in amperes (A)
  • S is the apparent power in volt-amperes (VA)
  • V is the line-to-line voltage in volts (V)

Calculation Steps

  1. Determine if the system is single-phase or three-phase
  2. Identify the apparent power in kVA
  3. Identify the voltage in volts
  4. Convert kVA to VA by multiplying by 1000
  5. Apply the appropriate formula based on the phase
  6. The result is the current in amperes

Example Calculation

Let's calculate the current for a three-phase system with 100 kVA of apparent power at 480 volts:

  1. Identify the given values: \[S = 100 \text{ kVA} = 100,000 \text{ VA}\] \[V = 480 \text{ volts}\]
  2. Apply the three-phase formula: \[I = \frac{S}{\sqrt{3} \cdot V} = \frac{100,000}{\sqrt{3} \cdot 480} \approx 120.3 \text{ amperes}\]

Therefore, in a three-phase system with 100 kVA of apparent power at 480 volts, the current is approximately 120.3 amperes.

Calculation Visualization

kVA Volts Amps 100 kVA 480 V 120.3 A kVA, Volts, and Amps Comparison

This bar chart visually compares the input apparent power (100 kVA), the voltage (480 V), and the resulting current (120.3 A) from our example calculation. The height of each bar is proportional to its value, illustrating the relationship between apparent power, voltage, and current in electrical systems.

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