The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction , the efficiency of any machine is always less than 100 percent.
Why is the efficiency of a machine always less than one?
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.
Is there a machine that is 100 percent efficient?
A machine cannot be 100 percent efficient because output of a machine is always less than input. A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.
Can a simple machine ever have an efficiency over 100 %?
Why can’t the output work for a machine be greater than the input work? A simple machine will have an efficiency of 100% if he output work of the machine is equal to the work input .
How can you increase the efficiency of a machine?
For a lever, you can increase the machine’s efficiency by reducing the friction .
Do you think efficiency can exceed 100 %?
Due to the conservation of energy, P can never be greater than C, and so the efficiency r is never greater than 100% (and in fact must be even less at finite temperatures).
Is there any real machine where its efficiency is 100% why?
Answer: In practice no machine can achieve 100% efficiency . When you mean 100% efficiency it means your input energy should be completely transformed to output energy. ... Various mechanical and electrical losses like friction and eddy current losses are the reasons behind the energy dissipation.
How do machines make work easier?
There are three ways simple machines make work easier: by increasing the distance through which force is applied , by changing the direction of applied force, or by multiplying force of speed of the energy applied.
What is the most efficient machine?
“ The bicycle is the most efficient machine ever created. Converting calories into gas, a bicycle gets the equivalent of 3,000 miles per gallon.” —Bill Strickland Chart by Kirkpatrick Sale ranks energy efficiency from low end (mouse, plane, car) to supreme (human on bicycle).
How can you have greater than 100% efficiency but not greater than 100% utilization?
How can you have greater than 100% efficiency but not greater than 100% utilization? The achievement of the greater efficiency more than 100% can be achieved when the inputs of an organization are defined in a unique way making the work output such as product performance to be unique exceeding the 100 %.
Is 100 energy efficiency possible?
It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.
What prevents machines from being 100 efficient?
Machines are not 100% efficient because some of the work done by a machine is used to overcome friction . So work output is always less than work input. ... Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.
What should be done to make simple machine more efficient?
Answer: Friction is the main factor which reduces the efficiency of a simple machine. Efficiency of a simple machine can be increased by reducing the friction. But oiling and greasing the machine is a useful way to increase the efficiency of a machine.
What reduces the efficiency of machines?
The efficiency of machine is reduced due to friction .
Is it possible to have 110% efficiency?
Explanation: The efficiency is the energy output, divided by the energy input in a machine and is expressed as a percentage. ... In case efficiency is calculated as 110% , it means energy output is 10% more than energy input. This is just not possible and means that it has been calculated or measured in a wrong way.
Can a machine be more than 100% efficient no yes impossible to determine?
All machines are subject to energy conservation in that no machine can output more energy (do more work) than the energy put into it. Work out is less than or equal to Work in , or Energy out is less than or equal to Energy in . In other words, no machine can be more than 100% efficient.
