Vatios a Amperios Calculadora
Introduzca su potencia en vatios y el voltaje del sistema para hallar el flujo de corriente. Ideal para sistemas de iluminación, pequeños electrodomésticos y electrónica de baja potencia.
Parámetros del Circuito
Vatios → Amperios
Los niveles de corriente seguros ayudan a evitar el sobrecalentamiento del cable.
La Fórmula de Conversión
La conversión de vatios a amperios requiere conocer el voltaje del circuito, y el factor de potencia en sistemas de CA.
Sistemas de CC
I = W ÷ V La forma más simple de la Ley de Ohm: divida los vatios entre los voltios para obtener amperios en cualquier circuito de CC.
CA Monofásica
I = W ÷ (V × PF) Las cargas de CA con un factor de potencia inferior a 1.0 consumen más corriente de la que sugiere su potencia nominal, debido al componente reactivo.
CA Trifásica
I = W ÷ (√3 × V × PF) Los sistemas trifásicos distribuyen la potencia entre tres fases; el factor √3 es obligatorio para las conversiones de voltaje línea a línea.
How to Convert Watts to Amps
The watts-to-amps conversion is one of the most frequently used calculations in electrical work — from selecting the right fuse for an electronics project to sizing a circuit breaker for a household appliance. Watts measure real power consumed; amps measure the current flowing through the conductor. You need voltage (and power factor for AC) to bridge the two.
Watts vs. VA: What's the Difference?
Watts (W) measure real power — the energy actually converted to heat, light, or motion. Volt-Amperes (VA) measure apparent power — what the source must supply, including reactive current. For resistive loads (heaters, incandescent bulbs) they're equal. For inductive loads (motors, transformers), VA is always higher than watts.
Common Household Examples
- 1500W Space Heater at 120V DC: 1500 ÷ 120 = 12.5A. Needs a 15A circuit at minimum.
- 800W Microwave at 120V AC (PF 0.95): 800 ÷ (120 × 0.95) ≈ 7.0A. Comfortably fits a 15A circuit.
- 3000W Dryer at 240V AC (PF 1.0): 3000 ÷ 240 = 12.5A — typically wired on a 30A circuit to allow for startup transients.
Step-by-Step Conversion
- Find the Wattage: Check the device label, user manual, or measured consumption with a watt meter.
- Confirm the Voltage: Use the outlet voltage — 120V or 240V in North America; 230V in Europe.
- Apply the Power Factor: Use 1.0 for pure resistive loads (heaters, light bulbs). Use 0.8–0.9 for motors and most AC equipment.
- Size Your Protection: The calculated amps is the continuous draw. Size breakers and fuses at 125% of continuous load per NEC requirements.