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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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How do you calculate the mechanical efficiency of a machine?
Work output divided by Work input Times 100
What is the mechanical efficiency of a machine whose work input is 100j and work output is 30j?
The mechanical efficiency of this machine is 30 percent.
Why is the efficiency of a machine less than 1?
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.
Is a machine physically possible that has an efficiency greater than 100 percent?
Not if the laws of physics - specifically thermodynamics - are correct.
Why is it that efficiency of a machine is less than 1?
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
