# 机械效率

## 滑轮

${\displaystyle ={\frac {G\cdot h}{F\cdot s}}}$[3]
${\displaystyle ={\frac {G\cdot h}{F\cdot nh}}}$
${\displaystyle ={\frac {G}{nF}}}$[b]

## 常见效率

16%-24% 40%-50% 22%-27% 28%-30% 60%-80% 50%-70% 80%-95% 49%-52%

## 参考资料

### 注释

1. ^ ${\displaystyle A_{0}}$表示输出功,${\displaystyle A_{r}}$表示输入功。
2. ^ 不计绳重和摩擦，计动滑轮重时公式为${\displaystyle \eta ={\frac {G}{G+G'}}}$,其中${\displaystyle G}$为物重，${\displaystyle G'}$为动滑轮重。

### 资料

1. ^ 机械效率（PPT）. : 7.
2. ^ Oxford English Dictionary. Oxford University Press. 1989. A wheel with a groove round its rim, a sheave. A wheel or drum fixed on a shaft and turned by a belt, cable, etc.,
3. ^ 机械效率（PPT）. : 18.
4. 机械效率
5. ^ Anderson, William Ballantyne. Physics for Technical Students: Mechanics and Heat. New York, USA: McGraw Hill. 1914: 112–122 [2008-05-11].
6. ^ Moon, Francis; Moon, F. C., The machines of Leonardo da Vinci and Franz Reuleaux:kinematics of machines from the Renaissance to the 20th century illustrated, annotated, Springer: pp. 28, 2007, ISBN 9781402055980