Amp to Watt Calculator
Convert current in amperes (Amps) to power in watts (W).
Ampere to Watt Converter
Common Amp to Watt Conversions
Click on these links to see instant conversions with common values:
Understanding Amp to Watt Conversion
Converting amperes (Amps) to watts (W) requires knowing the voltage (V) and, for AC circuits, the power factor (PF). Watts represent the real power consumed by a load.
Conversion Formulas
Watts (P) = Amps (I) × Volts (V)
For AC Single-Phase Circuits:
Watts (P) = Amps (I) × Volts (V) × Power Factor (PF)
For AC Three-Phase Circuits:
Watts (P) = √3 × Amps (I) × Volts (V) × Power Factor (PF)
Where:
• I = Current in Amperes
• V = Voltage in Volts
• P = Power in Watts
• PF = Power Factor (between 0 and 1)
• √3 ≈ 1.732
Key Concepts
- Ampere (A): The unit of electric current.
- Volt (V): The unit of electric potential difference.
- Watt (W): The unit of real power.
- Power Factor (PF): The ratio of real power to apparent power in AC circuits.
Typical Current and Voltage Ratings for Power
| Device | Current (A) | Voltage (V) | Approx. Power (Watts) |
|---|---|---|---|
| LED Strip Light | 0.5 | 12 | 6 |
| Phone Charger | 1 | 5 | 5 |
| Hair Dryer | 15 | 120 | 1800 |
| Electric Oven Element | 20 | 240 | 4800 |
| Small Electric Motor | 5 | 480 | 1920 (assuming PF=0.8) |
Frequently Asked Questions
What is the difference between Amps and Watts?
Amps (amperes) measure current, the flow of electric charge. Watts (W) measure power, the rate at which energy is consumed. To convert between them, you need to consider the voltage and, for AC circuits, the power factor.
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.