Volt to kW Calculator
Convert voltage to kilowatts with step-by-step calculations.
Voltage to Kilowatt Converter
Common Volt to kW Conversions
Click on these links to see instant conversions with common values:
Understanding Volt to kW Conversion
Converting volts to kilowatts requires knowing the current (Amps) and, for AC circuits, the power factor. Kilowatts represent the real power consumed by a load.
Conversion Formulas
For DC Circuits:
kW = (Volts (V) × Amps (I)) / 1000
For AC Single-Phase Circuits:
kW = (Volts (V) × Amps (I) × Power Factor (PF)) / 1000
For AC Three-Phase Circuits:
kW = (√3 × Volts (V) × Amps (I) × Power Factor (PF)) / 1000
Where:
• V = Voltage in Volts
• I = Current in Amperes
• kW = Power in Kilowatts
• PF = Power Factor (between 0 and 1)
• √3 ≈ 1.732
kW = (Volts (V) × Amps (I)) / 1000
For AC Single-Phase Circuits:
kW = (Volts (V) × Amps (I) × Power Factor (PF)) / 1000
For AC Three-Phase Circuits:
kW = (√3 × Volts (V) × Amps (I) × Power Factor (PF)) / 1000
Where:
• V = Voltage in Volts
• I = Current in Amperes
• kW = Power in Kilowatts
• PF = Power Factor (between 0 and 1)
• √3 ≈ 1.732
Key Concepts
- Volt (V): The unit of electric potential difference.
- Ampere (A): The unit of electric current, representing the flow of electric charge.
- Kilowatt (kW): The unit of real power, representing the rate at which electrical energy is consumed or produced.
- Power Factor (PF): In AC circuits, the ratio of real power to apparent power. It indicates how effectively electrical power is being converted into useful work output.
Typical Voltage and Current Ratings
| Device | Voltage (V) | Current (A) | Approx. Power (kW) |
|---|---|---|---|
| Smartphone Charger | 5 | 2 | 0.01 |
| Desktop Computer | 120 | 2.5 | 0.3 |
| Refrigerator | 120 | 5 | 0.6 |
| Electric Stove Burner | 240 | 10 | 2.4 |
| Electric Vehicle Charger (Level 2) | 240 | 30 | 7.2 |
Frequently Asked Questions
What is the difference between power and energy?
Power (kW) is the rate at which energy is used or produced, while energy (kWh) is the total amount of power consumed over a period of time. Think of power as speed and energy as distance traveled.
Why is power factor important in AC circuits?
In AC circuits, the power factor accounts for the phase difference between voltage and current. A low power factor means that more current is needed to deliver the same amount of real power, leading to inefficiencies and higher electricity bills.