저항 계산기

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

믿다

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

전체 사용자 가이드

저항기란 무엇입니까?

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

색상 코드: R = (digits) × multiplier ± tolerance%

시리즈: R_total = R1 + R2 + R3 + …

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

힘: P = V² / R  |  I = V / R

4 Calculation Types

색상 코드

저항기의 4밴드, 5밴드 또는 6밴드 색상 코드에서 저항을 디코딩합니다.

직렬저항

Calculate total resistance when resistors are connected end to end.

병렬 저항

Calculate total resistance when resistors are connected side by side.

전력 소비

전압과 저항을 사용하여 저항이 소비하는 전력량을 알아보세요.

이 계산기를 사용하는 방법

  1. 색상 코드, 계열, 병렬 또는 전력 등 계산하려는 항목을 선택하세요.
  2. Enter resistor values or select color bands.
  3. 필요한 경우 단위를 선택합니다(옴, 킬로옴, 메가옴).
  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

• 공차 : 갈색 ±1%, 빨간색 ±2%, 금색 ±5%, 은색 ±10%

Quick Examples

• 갈색-검은색-빨간색-금색 = 10 × 100 = 1000Ω(1kΩ) ±5%

• 직렬로 연결된 두 개의 100Ω 저항기 = 200Ω

• 병렬로 연결된 100Ω 저항기 2개 = 50Ω

• 100Ω에서 12V = 1.44W 전력 손실

중요 사항

  • 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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