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Power Calculation Formula:
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Power calculation in electrical systems determines the actual power consumed or produced by a device. While frequency (Hz) affects motor speed and performance, power (kW) is calculated from voltage, current, and power factor.
The calculator uses the power calculation formula:
Where:
Explanation: This formula calculates real power in kilowatts from electrical parameters. Note that frequency (Hz) is not directly used in power calculation but affects motor performance characteristics.
Details: Power factor represents the ratio of real power to apparent power. A higher power factor (closer to 1) indicates more efficient power usage, while lower power factors result in higher current draw for the same real power.
Tips: Enter voltage in volts, current in amperes, and power factor as a decimal between 0 and 1. All values must be positive numbers.
Q1: Why isn't frequency (Hz) used in the calculation?
A: Frequency affects motor speed and reactive power, but real power (kW) is calculated from voltage, current, and power factor regardless of frequency.
Q2: What is a typical power factor value?
A: Power factor typically ranges from 0.7 to 0.95 for most industrial equipment. Resistive loads have power factor of 1, while inductive loads have lower power factors.
Q3: How does frequency affect electrical systems?
A: Frequency (Hz) determines motor speed, affects transformer operation, and influences system stability, but doesn't directly determine power consumption.
Q4: Can I use this for three-phase systems?
A: This calculator is for single-phase systems. Three-phase power calculation requires additional factors (√3 for balanced three-phase systems).
Q5: Why convert to kilowatts?
A: Kilowatts are the standard unit for electrical power measurement and billing in most utility systems.