Efficiency is nothing but calculating how the machine is performing for what it has been made for,
Efficiency is usually calculated in % as (output/input )X100.
for Eg. the Thermal efficiency of an reciprocating gasoline engine can be calculated as follows,
Let,
the input for an reciprocating engine is 12MJ and its out put is 4MJ
then Efficiency is (4/12)X100 = 33%
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Work output divided by Work input Times 100
The mechanical efficiency of this machine is 30 percent.
An efficiency factor of 1 (or 100% efficiency) is not possible due to losses that cannot be reduced to zero. These losses take the form of friction, heat loss etc.
Not if the laws of physics - specifically thermodynamics - are correct.
The efficiency is always less than one because some of the energy is always useless for what you want. Most wasted energy eventually turns into heat. therefore the efficiency is like a percentage with 1 being 100% a device can't be 100% efficient as some energy is wasted. To work out the efficiency of a device you need to do the total useful energy produced divided by the total energy that is inputted into the device