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🔌 并联电阻计算器Parallel Resistor Calculator
输入多个电阻值，计算并联后的等效电阻 1/R = Σ(1/Rᵢ)，同时给出串联总电阻作对比；填入电压还能算出每个支路的电流和功率。Enter several resistor values to get the equivalent parallel resistance 1/R = Σ(1/Rᵢ), with the series total for comparison; add a voltage for each branch's current and power.
使用说明与常见问题How-to & FAQ
「并联电阻计算器」是什么？What is the Parallel Resistor Calculator tool?
输入多个电阻值，计算并联后的等效电阻 1/R = Σ(1/Rᵢ)，同时给出串联总电阻作对比；填入电压还能算出每个支路的电流和功率。Enter several resistor values to get the equivalent parallel resistance 1/R = Σ(1/Rᵢ), with the series total for comparison; add a voltage for each branch's current and power.
如何使用「并联电阻计算器」？How do I use the Parallel Resistor Calculator tool?
在「并联电阻计算器」中，填写「电压 V（可选）」等参数，结果会随输入实时计算并显示在下方。In the Parallel Resistor Calculator: Fill in "Voltage V (optional)"; results are recalculated instantly as you type.
并联电阻怎么算？How is parallel resistance calculated?
1/R = 1/R₁ + 1/R₂ + … + 1/Rₙ。两个电阻时 R = R₁R₂ ÷ (R₁ + R₂)；n 个相同电阻并联为 R ÷ n。并联结果总小于最小的那个电阻。1/R = 1/R₁ + 1/R₂ + … + 1/Rₙ. For two, R = R₁R₂ ÷ (R₁ + R₂); n equal resistors give R ÷ n. The result is always below the smallest resistor.
可以输入 4.7k、4k7 这类写法吗？Can I type 4.7k or 4k7?
可以。支持 k（千）、M（兆）、G（吉）后缀和元件上常见的 4k7、1M5、4R7 写法；按 SI 规定小写 m 表示毫（10m = 10 mΩ，4m7 = 4.7 mΩ），兆欧请用大写 M。小数请用“.”，像 2,2k 这样的逗号写法会被拒绝。Yes: k, M and G suffixes and the 4k7, 1M5 and 4R7 notation printed on parts are understood. As in SI, lowercase m means milli (10m = 10 mΩ, 4m7 = 4.7 mΩ); use capital M for megohms. Write decimals with "."; comma forms such as 2,2k are rejected.
支路电流怎么算？How are branch currents found?
并联各支路电压相同，Iᵢ = V ÷ Rᵢ，Pᵢ = V² ÷ Rᵢ。Every branch sees the same voltage, so Iᵢ = V ÷ Rᵢ and Pᵢ = V² ÷ Rᵢ.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「并联电阻计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Parallel Resistor Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「并联电阻计算器」免费吗？需要注册吗？Is the Parallel Resistor Calculator free? Do I need an account?
「并联电阻计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Parallel Resistor Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.