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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 it possible to design a machine that has an efficiency that is greater than 100 percent?
An ordinary domestic heat pump appears to have an efficiency of up to 300% or so. That is it will deliver 3kw of heat for each 1kw of electricity it consumes. But that is illusory because it extracts the extra heat from the water vapour in the air. So in real life, the laws of physics win out.
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.
How do you calculate the efficiency of a machine?
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%
How do you calculate the mechanical efficiency of a machine?
Work output divided by Work input Times 100
