No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). … That is why
100% efficiency in machines shall not be possible
.
What are some efficient machines?
However, some of the input energy does not contribute to the output work and is lost to such things as friction and heat. Examples of machine efficiency include
a lever, automobile, and perpetual motion machine
.
Which machine has the highest efficiency?
The most efficient electrical machine is the
transformer
. Transformers have efficiency above 95%. The autotransformer has an efficiency of close to 98%.
What is an efficient machine?
The efficiency of
any machine measures the degree to which friction and other factors reduce the actual work output of the machine from its theoretical maximum
. A frictionless machine would have an efficiency of 100%. A machine with an efficiency of 20% has an output only one fifth of its theoretical output.
What is 100% efficiency called?
A simple machine, such as a lever, pulley, or gear train, is “ideal” if the power input is equal to the power output of the device, which means there are no losses. In this case, the
mechanical efficiency
is 100%.
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.
Why can a machine not be 100% 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.
What is the most efficient thing on earth?
The very best (and most expensive)
solar panels
are 46% efficient at converting sunlight to electricity; wind turbines are limited by Betz’s law to a theoretical maximum of 59.3% efficiency, but in real life, turbines convert wind energy to electricity at 75% to 80% of the Betz limit.
How do you find efficiency?
The work efficiency formula is
efficiency = output / input
, and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it’s energy production or machine efficiency.
What improves the efficiency of a machine?
The efficiency of machines in any industry depends on the healthy monitoring, which reduces the downtime, meaning the continuous productivity of the machinery. …
Preventive maintenance
is where measure are taken beforehand so that the chances of breakdown are minimised resulting in increased efficiency of machines.
What is the efficiency of simple machines?
Simple machines always have efficiencies of
less than 1.0
due to internal friction. Energy conservation. Ignoring for a moment the losses of energy due to friction, the work done on a simple machine is the same as the work done by the machine to perform some sort of task.
What is the efficiency of a machine that requires 100J?
Efficiency = (work
out
)/(work
in
)(100%) = (35 J)/(100J)(100%) =
35%
Can you have over 100 percent efficiency?
Over 100% efficiency was reached in the
experiments
, all without violating energy conservation principles. The best efficiency was reached when such a LED was plugged to 30 picowatts, powering a LED which produced 69 picowatts of light, in the trillionth of a watt order – 230% efficiency.
Why is efficiency always less than 100%?
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.
What is impossible for a machine?
What is impossible for a machine to do? …
It can apply a force to an object in a different direction than the force applied to the machine
. It can increase the distance through which a force acts by exerting less force than was used on it.
What do you mean by efficiency of a machine is 90%?
Answer: It means
a simple machine can work or do its function with
90% in a good way. Or a simple machine had capacity to do 90% work.
