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Answered 2009-01-22 08:29:29

94 percent (which is easily calculated, 3760/4000x100).

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A machine is supplied energy at a rate of 4000 W and does useful at a rate of 3760 W What is the efficiency of the machine?

94% for sure


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.


What machine is supplied energy at a rate of 4000 w and does useful work at rate of 3760 w what is the efficiency of the machine?

3760 / 4000 = 0.94 = 94% efficient


A machine is supplied energy at a rate of 4000 W and does useful work at a rate of 3760 W. What is the efficiency of the machine?

Just divide the useful work by the supplied power. If you want to have the answer in percent, multiply the result by 100.


How do you work out the efficiency of a device?

By dividing the useful energy transferred by total energy supplied.


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.


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.


What percentage of energy is converted into useful energy?

It depends on the efficiency of the machine. No machine is perfect and there are always losses and waste. Usually the losses are a greater percentage than the useful energy.


Why does a high-efficiency machine is more desirable than low-efficiency machine?

High efficiency means that a large percentage of the energy used is converted to something useful (the desired output of the machine), and a low percentage is wasted.High efficiency means that a large percentage of the energy used is converted to something useful (the desired output of the machine), and a low percentage is wasted.High efficiency means that a large percentage of the energy used is converted to something useful (the desired output of the machine), and a low percentage is wasted.High efficiency means that a large percentage of the energy used is converted to something useful (the desired output of the machine), and a low percentage is wasted.


What is the efficiency of a machine that requires 100 joules of input energy to do 35 joules of useful work?

The machine efficiency is 35 percent (35/100).


What is the efficiency of a machine that requires 120J of input energy to do 35 J of useful work?

The idea is to divide the useful work by the input energy.


What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?

Such a machine would have an efficiency of 100% and, as the question suggests, it would be a miracle. No real machine is 100% efficient because there are always losses.


What is the Scientific definition for ideal machine?

An ideal machine is one in which no part of the input energy to the machine gets wasted and the whole input energy is converted into the useful work. The efficiency of such a machine is 100%.


The percentage of energy from a fuel that is actually used to perform work is its?

That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.That is called efficiency. An efficiency of 1 (or 100%) means that all the energy is converted into useful work.


How do you solve for efficiency?

vague question. Efficiency in terms of energy = useful energy/total energy x 100 vague question. Efficiency in terms of energy = useful energy/total energy x 100


What does energy efficient mean?

Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The useful output may be electric power, mechanical work, or heat.


What is the formula for efficiency of a machine?

useful energy output divided by total energy output x 100 give answer as a percentage, which is why you multiplied by 100


How is the efficiency of a machine calculated?

Efficiency = useful output power / input power


What is the efficiency equation for energy?

efficiency=(useful energy output/ total enerygy)*100


The amount of useful energy you get from a system is its what?

energy efficiency


How do you find the efficiency of a simple machine?

The efficiency of a machine is found by considering the useful energy or work that comes out of it, and dividing this by the work that you put into it. Multiply by 100 to get the answer in terms of percentage. You should never get more than 100% efficiency, or 100%, since energy will be lost (to heat caused by friction for example).


The amount of useful energy you get from a system?

Is it's Energy Efficiency.


What is the measure of how much work put into a machine is changed to useful work out by the machine?

Efficiency


Define efficiency for a simple machine?

Efficiency for a simple machine is (useful work out) / (total work in). The expression above is usually multiplied by 100 to give percentage efficiency.


What is the ratio of useful energy to total input energy?

efficiencyThe ratio of useful energy to total input energy is called efficiency. It refers to the percentage of the work input that is converted to work output.


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