⚙️ 效率计算器Efficiency Calculator

使用说明与常见问题How-to & FAQ

「效率计算器」是什么？What is the Efficiency Calculator tool?

按 效率 = 有用输出 ÷ 输入 × 100% 计算机器、电机、电源等的效率和损耗，也可以由效率反求输出或所需输入；输入和输出用同一单位（W、J、kWh 等）。Calculate efficiency = useful output ÷ input × 100% for a machine, motor or power supply, with the losses, or solve for output or required input from the efficiency; use the same unit for input and output (W, J, kWh, …).

如何使用「效率计算器」？How do I use the Efficiency Calculator tool?

在「效率计算器」中，填写「求解」、「输入」、「有用输出」、「效率 %」等参数，结果会随输入实时计算并显示在下方。In the Efficiency Calculator: Fill in "Solve for", "Input", "Useful output", "Efficiency %"; results are recalculated instantly as you type.

效率用什么公式算？What is the formula?

η = 有用输出 ÷ 输入 × 100%，损耗 = 输入 − 输出。输入和输出可以是功率（W）也可以是能量（J、kWh），但两者单位必须相同。η = useful output ÷ input × 100%, and losses = input − output. Both can be power (W) or energy (J, kWh) but must use the same unit.

效率能超过 100% 吗？Can efficiency exceed 100%?

不能，这违反能量守恒。热泵的「能效比（COP）」可以大于 1，是因为它搬运的是环境中的热量，那不是这里定义的效率。No, that would break energy conservation. A heat pump's COP can exceed 1 because it moves heat from its surroundings; that is not efficiency as defined here.

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

「效率计算器」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 Efficiency 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.

「效率计算器」免费吗？需要注册吗？Is the Efficiency Calculator free? Do I need an account?

「效率计算器」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 Efficiency 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.