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Electrical Power Formula:
For 3-phase systems, multiply denominator by \( \sqrt{3} \):
\[ I = \frac{kW \times 1000}{V \times \sqrt{3}} \]
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The kW to amps conversion calculates the electric current (in amperes) flowing in a circuit based on the power (in kilowatts) and voltage. This is essential for electrical system design, circuit protection, and equipment selection.
The calculator uses the electrical power formula:
For 3-phase systems:
\[ I = \frac{kW \times 1000}{V \times \sqrt{3}} \]Where:
Explanation: The formula converts kilowatts to watts (×1000), then divides by voltage to get current. For 3-phase systems, the denominator includes the square root of 3 to account for phase relationships.
Details: Accurate current calculation is crucial for selecting proper wire sizes, circuit breakers, and ensuring electrical safety. It helps prevent overheating and potential fire hazards.
Tips: Enter power in kW, voltage in volts, and select single-phase or three-phase system. All values must be positive numbers.
Q1: What's the difference between single-phase and three-phase?
A: Single-phase has one alternating current waveform, used in most homes. Three-phase has three waveforms 120° apart, used in industrial/commercial settings for higher power.
Q2: Why multiply by 1000 in the formula?
A: This converts kilowatts (kW) to watts (W), since 1 kW = 1000 W. The basic power formula uses watts (P = VI).
Q3: What voltage should I use for home calculations?
A: In North America, use 120V for standard outlets and 240V for large appliances. Elsewhere, 230V is common.
Q4: Does power factor affect this calculation?
A: This calculator assumes unity power factor (1.0). For reactive loads, divide by power factor for true current.
Q5: How accurate is this calculation?
A: It's theoretically exact for DC or AC with unity power factor. For AC with power factor <1, actual current will be higher.