Potencia Eléctrica
Calcula la potencia eléctrica P = VI, P = I²R o P = V²/R. Despeja voltaje, corriente o resistencia en vatios.
Fórmula principal
P = IV, P = V^2/R, P = I^2R
How do you calculate electric power?
Use P = V × I when voltage and current are known. With Ohm’s law you can also write P = I²R or P = V²/R. Rearrange to find V or I when power is given. Pick the form that matches the two values you already have.
Sobre esta herramienta
La potencia eléctrica usa P = VI, P = V²/R o P = I²R. Despeja potencia, voltaje, corriente o resistencia en circuitos introductorios.
Cómo usar esta calculadora
- Elige la variable que quieres despejar y confirma qué valores ya conoces.
- Introduce los datos en unidades coherentes antes de calcular.
- Comprueba si el resultado es físicamente razonable comparándolo con las entradas.
- Usa el desglose paso a paso para ver cómo se aplicó la fórmula.
Ejemplos resueltos
Example 1: P = VI
V = 12 V, I = 2.0 A. P = (12)(2.0) = 24 W.
Example 2: P = I²R
I = 0.50 A through R = 40 Ω. P = (0.50)²(40) = 0.25 × 40 = 10 W.
Example 3: P = V²/R
V = 120 V across R = 240 Ω. P = (120)² / 240 = 14400 / 240 = 60 W.
Preguntas frecuentes
What is the electric power formula?
The basic form is P = V I. Equivalent forms are P = I²R and P = V²/R when the resistor obeys Ohm’s law. Power is in watts when V is in volts, I in amperes, and R in ohms.
Which power formula should I use?
Use P = VI if you know voltage and current. Use P = I²R if you know current and resistance. Use P = V²/R if you know voltage and resistance.
How is electric power different from mechanical power?
Both are measured in watts, but mechanical power is often P = W/t or P = Fv. Electric power comes from circuit quantities V, I, and R. Use the matching calculator for each context.
How do mA and kΩ affect power?
Convert first: 1 mA = 0.001 A and 1 kΩ = 1000 Ω. Leaving milli/kilo units unconverted makes P wrong by large factors.
How does electric power relate to Ohm’s law?
Ohm’s law V = IR lets you rewrite P = VI as P = I²R or P = V²/R. Find the missing circuit quantity with the Ohm’s law calculator, then compute power.