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⚡ kVA 视在功率kVA Calculator
单相 kVA = V × I / 1000，三相 kVA = √3 × V（线电压）× I / 1000；给出功率因数时同时算 kW。本地处理。Single-phase kVA = V × I / 1000; three-phase kVA = √3 × V (line) × I / 1000; with a power factor, kW too. Processed locally.
使用说明与常见问题How-to & FAQ
「kVA 视在功率」是什么？What is the kVA Calculator tool?
单相 kVA = V × I / 1000，三相 kVA = √3 × V（线电压）× I / 1000；给出功率因数时同时算 kW。本地处理。Single-phase kVA = V × I / 1000; three-phase kVA = √3 × V (line) × I / 1000; with a power factor, kW too. Processed locally.
如何使用「kVA 视在功率」？How do I use the kVA Calculator tool?
在「kVA 视在功率」中，填写「相数」、「电压 V」、「电流 A」、「功率因数（可选）」等参数，结果会随输入实时计算并显示在下方。In the kVA Calculator: Fill in "Phase", "Voltage V", "Current A", "Power factor (optional)"; results are recalculated instantly as you type.
kVA 和 kW？kVA vs kW?
kW = kVA × 功率因数；变压器、UPS 常按 kVA 标称。kW = kVA × power factor; transformers and UPS units are rated in kVA.
能举个计算实例吗？Can you show a worked example?
例如在「kVA 视在功率」中填 相数 = 单相，电压 V = 230，电流 A = 10，结果区显示：视在功率：2.3 kVAFor example, entering Phase = Single-phase, Voltage V = 230, Current A = 10 in the kVA Calculator gives: Apparent power: 2.3 kVA
哪些输入会被检查？Which inputs are validated?
「kVA 视在功率」会检查这些输入——「电压 V」、「电流 A」：必须填写，须大于 0；「功率因数（可选）」：不能为负数；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The kVA Calculator checks its inputs — "Voltage V", "Current A": required, must be greater than 0; "Power factor (optional)": cannot be negative; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「kVA 视在功率」的设置：「相数」可选 单相、三相（默认 单相）；「电压 V」默认 230；「电流 A」默认 10；「功率因数（可选）」可留空。每次生成结果都按当前设置处理。Settings in the kVA Calculator — "Phase": Single-phase, Three-phase (default Single-phase); "Voltage V" default 230; "Current A" default 10; "Power factor (optional)" optional. The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「kVA 视在功率」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 kVA 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.
「kVA 视在功率」免费吗？需要注册吗？Is the kVA Calculator free? Do I need an account?
「kVA 视在功率」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 kVA 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.