Resistencia Equivalente
Halla la resistencia equivalente en serie o en paralelo. Usa Rₜ = R₁ + R₂ o 1/Rₜ = 1/R₁ + 1/R₂ con pasos.
Fórmula principal
Series: R_t = R1 + R2; Parallel: 1/R_t = 1/R1 + 1/R2
How do you calculate equivalent resistance?
Series (one path): Rₜ = R₁ + R₂. Parallel (same two nodes): 1/Rₜ = 1/R₁ + 1/R₂, then invert for Rₜ. For two resistors in parallel you can also use Rₜ = (R₁ R₂)/(R₁ + R₂). Equal resistors in parallel give Rₜ = R/2.
Sobre esta herramienta
La resistencia equivalente combina resistores en serie (Rₜ = R₁ + R₂) o en paralelo (1/Rₜ = 1/R₁ + 1/R₂). Esta calculadora muestra ambas fórmulas, pasos y errores típicos al mezclar ramas.
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: series 100 Ω and 220 Ω
Rₜ = R₁ + R₂ = 100 + 220 = 320 Ω. Total current from a battery sees 320 Ω of opposition.
Example 2: parallel 100 Ω and 100 Ω
1/Rₜ = 1/100 + 1/100 = 0.02, so Rₜ = 50 Ω. Equal pair shortcut: R/2 = 50 Ω.
Example 3: parallel 6 Ω and 3 Ω
1/Rₜ = 1/6 + 1/3 = 1/6 + 2/6 = 3/6. Rₜ = 2 Ω. Product-over-sum: (6×3)/(6+3) = 2 Ω.
Preguntas frecuentes
What is the series resistance formula?
For resistors in series, Rₜ = R₁ + R₂ + … . Current is the same through each; voltages add across them. For two resistors: Rₜ = R₁ + R₂.
What is the parallel resistance formula?
For resistors in parallel, 1/Rₜ = 1/R₁ + 1/R₂ + … . Voltage is the same across each branch. Two-resistor form: Rₜ = (R₁ R₂)/(R₁ + R₂).
How do I tell series from parallel?
Series: one path — current through R₁ must also pass through R₂. Parallel: the wire splits so each resistor has its own path between the same two junctions.
Why is parallel resistance smaller?
Parallel branches give current more paths, so the combination draws more current from the same voltage — that means lower equivalent R by Ohm's law.
What do I do after finding Rₜ?
Treat Rₜ like a single resistor in Ohm's law (V = IR) or electric power (P = I²R, P = V²/R). Use the voltage divider calculator when two resistors divide a supply, not for a simple parallel pair.