In mechanical engineering, mechanical efficiency is a dimensionless number that measures the effectiveness of a mechanism or machine in transforming the power input to the device to power output. A machine is a mechanical linkage in which force is applied at one point, and the force does work moving a load at another point. At any instant the power input to a machine is equal to the input force multiplied by the velocity of the input point, similarly the power output is equal to the force exerted on the load multiplied by the velocity of the load. The mechanical efficiency of a machine (often represented by the Greek letter eta ) is a dimensionless number between 0 and 1 that is the ratio between the power output of the machine and the power input
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| - كفاءة ميكانيكية (ar)
- Rendimento meccanico (it)
- Mechanical efficiency (en)
- 机械效率 (zh)
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| - Il rendimento meccanico rappresenta l'efficienza con cui i componenti meccanici scorrono/rotolano tra di loro senza perdere energia. (it)
- 机械效率（英語：Mechanical efficiency），常用希腊字母η表示。是机械输出功（有用功）和输入功（动力功）的比值。用公式表示为由于大多数机械是在接收输入功的同时就输出功，而且输入输出的快慢也互相适应，所以机械效率又可定义为：输出功率 与输入功率 的百分比，即。在初中物理，机械效率被定义为有用功与总功的比值，即 (zh)
- الكفاءة الميكانيكية يستخدم مصطلح الكفاءة الميكانيكية للتعبير عن مقدار الشغل المستفاد به من المحرك ومقدار المفقود في الاحتكاك. نستطيع حساب الكفاءة الميكانيكية من خلال المعادلة التالية : حيث أن : wb: شغل الفرملة (الشغل الناتج من المحرك بعد طرح المفاقيد الاحتكاكية _الشغل المستفاد به_ ) wi:الشغل الكلي ( الشغل الكلي الناتج من إسطوانات الاحتراق ويشمل شغل الفرملة والشغل المفقود في الاحتكاك). (ar)
- In mechanical engineering, mechanical efficiency is a dimensionless number that measures the effectiveness of a mechanism or machine in transforming the power input to the device to power output. A machine is a mechanical linkage in which force is applied at one point, and the force does work moving a load at another point. At any instant the power input to a machine is equal to the input force multiplied by the velocity of the input point, similarly the power output is equal to the force exerted on the load multiplied by the velocity of the load. The mechanical efficiency of a machine (often represented by the Greek letter eta ) is a dimensionless number between 0 and 1 that is the ratio between the power output of the machine and the power input (en)
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| - الكفاءة الميكانيكية يستخدم مصطلح الكفاءة الميكانيكية للتعبير عن مقدار الشغل المستفاد به من المحرك ومقدار المفقود في الاحتكاك. نستطيع حساب الكفاءة الميكانيكية من خلال المعادلة التالية : حيث أن : wb: شغل الفرملة (الشغل الناتج من المحرك بعد طرح المفاقيد الاحتكاكية _الشغل المستفاد به_ ) wi:الشغل الكلي ( الشغل الكلي الناتج من إسطوانات الاحتراق ويشمل شغل الفرملة والشغل المفقود في الاحتكاك). من المستحيل أن تتعدى قيمة الكفاءة الميكانيكية الواحد أي 100 ٪ فإذا تعدت الواحد هذا يعني أننا نحصل على طاقة من عدم وهذا مخالف لكل القوانين الفيزيائية، كما أنه أيضاً من المستحيل الوصول إلى قيمة كفاءة ميكانيكية تساوي الواحد فلابد أن يكون هناك خسارة بالطاقة إما على شكل احتكاك أو على شكل حرارة. (ar)
- In mechanical engineering, mechanical efficiency is a dimensionless number that measures the effectiveness of a mechanism or machine in transforming the power input to the device to power output. A machine is a mechanical linkage in which force is applied at one point, and the force does work moving a load at another point. At any instant the power input to a machine is equal to the input force multiplied by the velocity of the input point, similarly the power output is equal to the force exerted on the load multiplied by the velocity of the load. The mechanical efficiency of a machine (often represented by the Greek letter eta ) is a dimensionless number between 0 and 1 that is the ratio between the power output of the machine and the power input Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of a machine can never be greater than its input, so the efficiency can never be greater than 1. All real machines lose energy to friction; the energy is dissipated as heat. Therefore their power output is less than their power input Therefore the efficiency of all real machines is less than 1. A hypothetical machine without friction is called an ideal machine, such a machine would not have any energy losses, so its output power would equal its input power, and its efficiency would be 1. (100%) For hydropower turbines the efficiency is referred to as hydraulic efficiency. (en)
- Il rendimento meccanico rappresenta l'efficienza con cui i componenti meccanici scorrono/rotolano tra di loro senza perdere energia. (it)
- 机械效率（英語：Mechanical efficiency），常用希腊字母η表示。是机械输出功（有用功）和输入功（动力功）的比值。用公式表示为由于大多数机械是在接收输入功的同时就输出功，而且输入输出的快慢也互相适应，所以机械效率又可定义为：输出功率 与输入功率 的百分比，即。在初中物理，机械效率被定义为有用功与总功的比值，即 (zh)
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