Mechanical efficiency

In mechanical engineering, mechanical efficiency is a dimensionless ratio that measures the efficiency 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 η) is a dimensionless number between 0 and 1 that is the ratio between the power output of the machine and the power input[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%).
mechanical engineeringdimensionless ratioefficiencymechanismmachinemechanical linkagevelocityconservation of energyfrictiondissipatedhypotheticalideal machinehydropowerMechanical advantageThermal efficiencyElectrical efficiencyInternal combustion engineElectric motorVelocity ratio