🔋 电容计算器Capacitance Calculator

使用说明与常见问题How-to & FAQ

「电容计算器」是什么？What is the Capacitance Calculator tool?

计算电容：由电荷和电压 C = Q/V，平行板电容 C = ε₀·εᵣ·A/d，或多个电容串联、并联的总电容；同时给出储存的能量 ½CV²。Calculate capacitance from charge and voltage (C = Q/V), for a parallel-plate capacitor (C = ε₀·εᵣ·A/d), or for capacitors in series or parallel, with the stored energy ½CV².

如何使用「电容计算器」？How do I use the Capacitance Calculator tool?

在「电容计算器」中，填写「计算」、「极板面积 cm²」、「极板间距 mm」、「相对介电常数 εᵣ」、「电荷 µC」等参数，结果会随输入实时计算并显示在下方。In the Capacitance Calculator: Fill in "Calculate", "Plate area cm²", "Plate gap mm", "Relative permittivity εᵣ", "Charge µC"; results are recalculated instantly as you type.

用的是哪些公式？What are the formulas?

C = Q ÷ V；平行板 C = ε₀εᵣA ÷ d，ε₀ = 8.8541878128 × 10⁻¹² F/m（CODATA 2018）；并联 C = ΣCᵢ，串联 1/C = Σ(1/Cᵢ)；能量 E = ½CV²。C = Q ÷ V; parallel plates C = ε₀εᵣA ÷ d with ε₀ = 8.8541878128 × 10⁻¹² F/m (CODATA 2018); parallel C = ΣCᵢ, series 1/C = Σ(1/Cᵢ); energy E = ½CV².

电容串并联和电阻正好相反？Is it the reverse of resistors?

是的：电容并联直接相加，串联按倒数相加，与电阻相反。Yes: capacitors in parallel add directly and in series add as reciprocals — the opposite of resistors.

平行板公式准吗？How accurate is the parallel-plate formula?

忽略了边缘场，极板尺寸远大于间距时才准确；介电常数也只是典型值。It ignores fringing fields, so it is accurate only when the plates are much larger than the gap; the permittivities are typical values.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「电容计算器」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 Capacitance 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.

「电容计算器」免费吗？需要注册吗？Is the Capacitance Calculator free? Do I need an account?

「电容计算器」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 Capacitance 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.