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💡 LED 限流电阻计算器LED Resistor Calculator
根据电源电压、LED 正向电压和电流计算限流电阻值、功率，并推荐 E24 标准阻值。Current-limiting resistor for LEDs from supply voltage, forward voltage and current, with the nearest E24 value.
使用说明与常见问题How-to & FAQ
「LED 限流电阻计算器」是什么？What is the LED Resistor Calculator tool?
根据电源电压、LED 正向电压和电流计算限流电阻值、功率，并推荐 E24 标准阻值。Current-limiting resistor for LEDs from supply voltage, forward voltage and current, with the nearest E24 value.
如何使用「LED 限流电阻计算器」？How do I use the LED Resistor Calculator tool?
在「LED 限流电阻计算器」中，填写「电源电压 V」、「LED 正向电压 V」、「电流 mA」、「串联 LED 数」等参数，结果会随输入实时计算并显示在下方。In the LED Resistor Calculator: Fill in "Supply V", "LED forward V", "Current mA", "LEDs in series"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「LED 限流电阻计算器」使用教科书标准公式，并列出所用公式和中间值，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 LED Resistor Calculator uses standard textbook formulas and shows them, which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「LED 限流电阻计算器」免费吗？需要注册吗？Is the LED Resistor Calculator free? Do I need an account?
「LED 限流电阻计算器」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 LED 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.