Calculadora de resistencia

Decode resistor color codes, calculate series and parallel resistance, and find power dissipation. Free, fast, and easy to use.

Calcular

Choose a calculation type, enter your values or select color bands, and click Calculate Now to get instant results with step-by-step solutions.

Guía de usuario completa

¿Qué es una resistencia?

A resistor is an electrical component that limits or controls the flow of electric current in a circuit. Resistance is measured in ohms (Ω) and is usually shown by colored bands on the resistor body. This tool helps you decode those color bands, combine resistors in series or parallel, and calculate power dissipation — all for free.

All Formulas at a Glance

Código de colores: R = (digits) × multiplier ± tolerance%

Serie: R_total = R1 + R2 + R3 + …

Paralelo: 1/R_total = 1/R1 + 1/R2 + 1/R3 + …

Fuerza: P = V² / R  |  I = V / R

4 Calculation Types

Código de colores

Decodifica la resistencia a partir de códigos de colores de 4, 5 o 6 bandas en una resistencia.

Resistencia en serie

Calculate total resistance when resistors are connected end to end.

Resistencia paralela

Calculate total resistance when resistors are connected side by side.

Disipación de energía

Encuentre cuánta potencia disipa una resistencia usando voltaje y resistencia.

Cómo utilizar esta calculadora

  1. Elija lo que desea calcular: código de color, serie, paralelo o potencia.
  2. Enter resistor values or select color bands.
  3. Elija unidades si es necesario (ohmios, kiloohmios, megaohmios).
  4. Click Calculate Now and see your answer with a step-by-step breakdown and chart.

Resistor Color Code Chart

• Black=0, Brown=1, Red=2, Orange=3, Yellow=4

• Green=5, Blue=6, Violet=7, Gray=8, White=9

• Gold multiplier = ×0.1, Silver multiplier = ×0.01

• Tolerancia: Marrón ±1%, Rojo ±2%, Oro ±5%, Plata ±10%

Quick Examples

• Marrón-Negro-Rojo-Oro = 10 × 100 = 1000 Ω (1 kΩ) ±5%

• Dos resistencias de 100 Ω en serie = 200 Ω

• Dos resistencias de 100 Ω en paralelo = 50 Ω

• 12 V a través de 100 Ω = 1,44 W de disipación de potencia

Notas importantes

  • All resistance values must be greater than zero.
  • Color bands are read from left to right — the tolerance band is usually gold or silver.
  • Unit conversions are done automatically — just pick your preferred unit.
  • At least two resistors are needed for series and parallel calculations.

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