Volt to Watt Calculator
Convert voltage in volts (V) to power in watts (W).
Voltage to Watt Converter
Common Volt to Watt Conversions
Click on these links to see instant conversions with common values:
Understanding Volt to Watt Conversion
Converting voltage (V) to power in watts (W) requires knowing the current (Amps) and, for AC circuits, the power factor. Watts represent the real power consumed by a load.
Conversion Formulas
For DC Circuits:
Watts (P) = Volts (V) × Amps (I)
For AC Single-Phase Circuits:
Watts (P) = Volts (V) × Amps (I) × Power Factor (PF)
For AC Three-Phase Circuits:
Watts (P) = √3 × Volts (V) × Amps (I) × Power Factor (PF)
Where:
• V = Voltage in Volts
• I = Current in Amperes
• P = Power in Watts
• PF = Power Factor (between 0 and 1)
• √3 ≈ 1.732
Watts (P) = Volts (V) × Amps (I)
For AC Single-Phase Circuits:
Watts (P) = Volts (V) × Amps (I) × Power Factor (PF)
For AC Three-Phase Circuits:
Watts (P) = √3 × Volts (V) × Amps (I) × Power Factor (PF)
Where:
• V = Voltage in Volts
• I = Current in Amperes
• P = Power in Watts
• 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.
- Watt (W): The unit of real power.
- Power Factor (PF): The ratio of real power to apparent power in AC circuits.
Typical Voltage and Current Ratings for Power
| Device | Voltage (V) | Current (A) | Approx. Power (Watts) |
|---|---|---|---|
| LED Light Bulb | 120 | 0.08 | 10 |
| Laptop Charger | 120 | 0.5 | 60 |
| Microwave Oven | 120 | 8.33 | 1000 |
| Electric Kettle | 240 | 9.17 | 2200 |
| Electric Vehicle Charger | 240 | 30 | 7200 |
Frequently Asked Questions
What is the relationship between voltage, current, and power?
These three quantities are interconnected. Power is the product of voltage and current (and power factor for AC circuits). If you know any two, you can calculate the third.
Why is power factor important in AC circuits?
In AC circuits, power factor accounts for the phase difference between voltage and current. A low power factor means that a larger current is needed to deliver the same amount of real power (W), leading to inefficiencies and higher electricity bills.