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⚡ 欧姆定律计算器Ohm's Law Calculator
填写电压、电流、电阻、功率中的任意两个，计算其余两个（V=IR，P=VI）。Enter any two of voltage, current, resistance and power to get the other two (V = IR, P = VI).
使用说明与常见问题How-to & FAQ
「欧姆定律计算器」是什么？What is the Ohm's Law Calculator?
填写电压、电流、电阻、功率中的任意两个，计算其余两个（V=IR，P=VI）。Enter any two of voltage, current, resistance and power to get the other two (V = IR, P = VI).
如何使用「欧姆定律计算器」？How do I use the Ohm's Law Calculator?
在「欧姆定律计算器」中，填写「电压 V」、「电流 A」、「电阻 Ω」、「功率 W」等参数，结果会随输入实时计算并显示在下方。In the Ohm's Law Calculator: Fill in "Voltage V", "Current A", "Resistance Ω", "Power W"; 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?
「欧姆定律计算器」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 Ohm's Law 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.
「欧姆定律计算器」免费吗？需要注册吗？Is the Ohm's Law Calculator free? Do I need an account?
「欧姆定律计算器」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 Ohm's Law 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.