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⚡ 瓦特转安培Watts to Amps Calculator
直流 / 单相：I = P ÷ V；三相：I = P ÷ (√3 × V × PF)。可设置「功率 W」、「电压 V」、「类型」、「功率因数」。DC / single-phase: I = P ÷ V; 3-phase: I = P ÷ (√3 × V × PF). Settings: Power W, Voltage V, Type, Power factor.
使用说明与常见问题How-to & FAQ
「瓦特转安培」是什么？What is the Watts to Amps Calculator tool?
直流 / 单相：I = P ÷ V；三相：I = P ÷ (√3 × V × PF)。可设置「功率 W」、「电压 V」、「类型」、「功率因数」。DC / single-phase: I = P ÷ V; 3-phase: I = P ÷ (√3 × V × PF). Settings: Power W, Voltage V, Type, Power factor.
如何使用「瓦特转安培」？How do I use the Watts to Amps Calculator tool?
在「瓦特转安培」中，填写「功率 W」、「电压 V」、「类型」、「功率因数」等参数，结果会随输入实时计算并显示在下方。In the Watts to Amps Calculator: Fill in "Power W", "Voltage V", "Type", "Power factor"; results are recalculated instantly as you type.
结果可以直接用来选导线或断路器吗？Can I size wires or breakers from the result?
不能直接用。电流 I = P ÷ V（三相 I = P ÷ (√3 × V × PF)）只是理论值，没有考虑线损、启动电流、环境温度和安全余量。选线和保护器件请按当地电气规范或请电工确认。Not directly. I = P ÷ V (or P ÷ (√3 × V × PF) for three-phase) is the theoretical current, without line losses, inrush, temperature or safety margins. Size wiring and breakers by your local electrical code or ask an electrician.
能举个计算实例吗？Can you show a worked example?
例如在「瓦特转安培」中填 功率 W = 1200，电压 V = 120，类型 = 直流/单相 PF=1，功率因数 = 1，结果区显示：电流：10 A；功率：1,200 W；电压：120 VFor example, entering Power W = 1200, Voltage V = 120, Type = DC or 1-phase, Power factor = 1 in the Watts to Amps Calculator gives: Current: 10 A; Power: 1,200 W; Voltage: 120 V
哪些输入会被检查？Which inputs are validated?
「瓦特转安培」会检查这些输入——「功率 W」、「电压 V」：必须填写，须大于 0；「功率因数」：必须填写，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 Watts to Amps Calculator checks its inputs — "Power W", "Voltage V": required, must be greater than 0; "Power factor": required, 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?
「瓦特转安培」的设置：「功率 W」默认 1200；「电压 V」默认 120；「类型」可选 直流/单相 PF=1、三相（默认 直流/单相 PF=1）；「功率因数」默认 0.9。每次生成结果都按当前设置处理。Settings in the Watts to Amps Calculator — "Power W" default 1200; "Voltage V" default 120; "Type": DC or 1-phase, 3-phase (default DC or 1-phase); "Power factor" default 0.9. 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?
「瓦特转安培」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 Watts to Amps 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.
「瓦特转安培」免费吗？需要注册吗？Is the Watts to Amps Calculator free? Do I need an account?
「瓦特转安培」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 Watts to Amps 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.