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⚡ 电势计算器Electric Potential Calculator
计算点电荷在距离 r 处产生的电势 V = kq/r，以及放入试探电荷时的电势能 U = kq₁q₂/r。Electric potential V = kq/r of a point charge at distance r, and the potential energy U = kq₁q₂/r with a second charge.
使用说明与常见问题How-to & FAQ
「电势计算器」是什么？What is the Electric Potential Calculator tool?
计算点电荷在距离 r 处产生的电势 V = kq/r，以及放入试探电荷时的电势能 U = kq₁q₂/r。Electric potential V = kq/r of a point charge at distance r, and the potential energy U = kq₁q₂/r with a second charge.
如何使用「电势计算器」？How do I use the Electric Potential Calculator tool?
在「电势计算器」中，填写「电荷 q」、「电荷单位」、「距离 r (m)」、「试探电荷 q₂(同单位，可选)」等参数，结果会随输入实时计算并显示在下方。In the Electric Potential Calculator: Fill in "Charge q", "Charge unit", "Distance r (m)", "Test charge q₂ (same unit, optional)"; results are recalculated instantly as you type.
库仑常数取多少？What value of k is used?
k = 1/(4πε₀) ≈ 8.9875517923 × 10⁹ N·m²/C²（CODATA 2018）。k = 1/(4πε₀) ≈ 8.9875517923 × 10⁹ N·m²/C² (CODATA 2018).
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「电势计算器」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 Electric Potential 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.
「电势计算器」免费吗？需要注册吗？Is the Electric Potential Calculator free? Do I need an account?
「电势计算器」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 Electric Potential 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.