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The efficiency of a machine is: (useful energy that comes out of the machine) divided by (energy put into the machine). It's really handy to know this before you spend a million dollars on a machine, and discover that even though you put enough energy into it to do the job, you're not getting enough out, and the job isn't getting done. Example: You need 100 watts of light dispersed in a room. You buy a 100-watt light bulb, screw it in, turn it on, and nobody in the room can read anything. You lose, because you failed to consider that the efficiency of the type of light bulb you bought is about 35%. That means for every 100 watts of electricity you put into the bulb, you get about 35 watts of light out of it. The other 65 watts of power comes out of the bulb in the form of heat. (Which explains why the air conditioning runs more when the lights are on.) Had you considered the 35% efficiency of the light bulb, and knowing that you needed 100 watts of light, you would have known to buy a bulb rated at (100 / 0.35) = 286 watts.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoit compares the input work to the output work
Wiki User
∙ 12y agoIn an ideal frictionless system, the work input equals the output and force.
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Wiki User
∙ 14y agoWhat does the efficiency of a machine describe?
Wiki User
∙ 15y agoYes it is. :]]]
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Describe why a high-efficiency machine is more desirable thana low-efficiency machine?
A high efficiency machine will produce more of what is it that you want with the same power as the low efficiency one. In other words, for a low efficiency machine do as much as a high efficiency one, you have to give it more power (energy).
What is the difference between an ideal machine and a real machine?
In ideal machine input is equal to output . The efficiency of ideal machine is 100% . In real machine input is not equal to output .The efficiency of ideal machine in not 100% . In ideal machine there is no lose of energy . In real machine there is lose of energy . In real machine there is no friction . While in real machine there is friction .
What are some benefits of a front loader washing machine?
Some of the benefits of a front loader washing machine include the fact that the they are manufactured to be high efficiency. High efficiency allows for the use of less energy and special detergent that allows for less to be used.
The ratio of output force to input force for a simple machine is called its advantage?
The answer is mechanical advantage, not efficiency!
Which machine has the greatest mechanical efficiency a block and tackle or a lever?
In theory there is no difference in efficiency (it would be 1), but in practice I think a block and tackle would lose more force to friction in the pulleys and between the rope and pulleys.
Describe why a high-efficiency machine is more desirable thana low-efficiency machine?
A high efficiency machine will produce more of what is it that you want with the same power as the low efficiency one. In other words, for a low efficiency machine do as much as a high efficiency one, you have to give it more power (energy).
Describe why a high-efficiency machine is more desirable than a low-efficiency machine?
Efficiency is the ratio of the energy converted into useful work by the machine to the energy supplied to the machine. Certainly it will not be possible to convert all the energy supplied into useful work because of wastage of energy due to so many reasons. So efficiency will be always less than 1. As the efficiency becomes more the loss would become less. Hence it is desirable.
How do you calculate efficiency and how is it expressed?
For efficiency, you have to consider the energy or work that you get out of the machine, compared to the energy or work that you put into the machine. Its what you get out, divided by what you put in. By multiplying the result by 100, you should then get the efficiency expressed as a percentage, which is the normal way of describe how efficient a machine or process is. efficiency = (Work out/Work in) x 100 Sometimes you are given the efficiency in a problem, but then have to calculate either the work out or work in, so then its just a case of rearranging the equation above.
If the input work on a machine is equal to its output work does the machine has efficiency?
If the useful energy output of a system is equal to the energy input, the following calculation can be done:Efficiency = (Useful energy out) / (Energy In)Efficiency = 1Efficiency = 100%Therefore, the machine you describe does have an efficiency value, which is equal to 100%. Very few situations like this exist though, unfortunately.
Why is a high efficiency machine is more desirable than a low efficiency machine?
A high efficiency machine will produce more of what is it that you want with the same power as the low efficiency one. In other words, for a low efficiency machine do as much as a high efficiency one, you have to give it more power (energy).
The efficiency of a machine is usually expressed in?
The efficiency of a machine is usually expressed as a percentage. The ideal efficiency of a machine is 100-percent.Another AnswerThere are no units of measurement for efficiency, because you are comparing like with like: output power divided by input power.
List and describe the three forms of informational efficiency?
List and describe the three forms of informational efficiency?
What is a machine with efficiency of less than one?
no machine has one
What is the machine efficiency of a machine that produces 400 joules of work output from a work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
What is the efficiency of the machine?
a machine applies a force of 100 newtons over a distance of 10 meters to raise a500 newtons drum 1.5 meters. what is efficiency of the machine ?
What is an efficiency ratio?
The efficiency ratio for a machine usually refers to the ratio of the useful energy available from a machine and the energy put into it.
How is a real machine and an ideal machine different?
An ideal machine can reach 100% efficiency as there is no friction or other restraints involved, whereas a real machine can never reach 100% efficiency.
