- 效率计算器 helps measure how effectively a system converts input energy into useful output energy or work. This tool is essential in engineering, manufacturing, electronics, and many industrial applications where energy conservation and performance tracking matter.

属于 功率 and energy calculator category, it evaluates how much of the supplied energy gets used for the intended purpose, and how much gets wasted due to losses like friction, 热, or electrical resistance. Efficiency is expressed as a percentage and indicates the system’s performance in real-world operating conditions.

formula of Efficiency Calculator

η = (P_out / P_in) * 100

地点：

η = Efficiency (as a percentage)

噘 = Useful power output (watts, or joules/second)

别针 =总计 电源输入 (watts, or joules/second)

怎么找 噘 和 别针:

P_out = W_useful / tP_in = W_total / t

W_useful = Useful energy or work delivered (in joules)

W_total = Total energy supplied, including losses (in joules)

t = 时间（秒）

Including system losses:

P_in = P_out + P_losses

地点：

P_losses = P_friction + P_heat + P_electrical + P_other

P_friction = Power lost to friction (watts)

P_heat = Power lost as heat (watts)

P_electrical = Power lost due to electrical resistance (watts)

P_other = Other system-specific losses (watts)

This extended formula is useful for understanding where energy losses occur, so you can take action to improve system efficiency.

通用参考表

按揭年数简介Formula or Example Use效率（η）% of useful power compared to total inputη = (P_out / P_in) * 100噘Useful output powerP_out = W_useful / t别针总输入功率P_in = W_total / tW_usefulOutput energy or worke.g., 600 joules of mechanical energyW_totalSupplied energy, including lossese.g., 800 joules of electrical energyP_lossesEnergy wasted due to inefficienciesP_losses = P_heat + P_friction + …能量转换Convert between units (J, kWh, cal, etc.)1 kWh = 3.6 million joules电源转换转化率 马力, watts, and BTUs1 HP = 745.7 watts; 1 BTU/hr = 0.2931 watts

This table helps users quickly understand and apply common terms without having to calculate each one manually.

Example of Efficiency Calculator

场景：A motor receives 1000 joules of electrical energy and delivers 700 joules as useful mechanical work in 10 seconds.

Step 1: Calculate Input and Output Power

P_in = W_total / t = 1000 / 10 = 100 wattsP_out = W_useful / t = 700 / 10 = 70 watts

步骤 2：将值代入公式

η = (P_out / P_in) * 100η = (70 / 100) * 100 = 70%

结果：The motor is 70% efficient, meaning 30% of the input energy is lost as heat or other forms of waste.

最常见的常见问题解答

什么是好的效率百分比？ It depends on the system. Electrical appliances often have 80% to 95% efficiency, while engines may range from 25% to 40%. Higher efficiency means less energy is wasted.

效率能超过100%吗？ No. Efficiency over 100% would mean the system outputs more energy than it receives, which violates the law of conservation of energy. However, in rare cases of misleading calculations or units, values might appear that way—always double-check your inputs.