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Turn the percentage into a decimal by dividing by 100: 91% --> .91

Work out = (efficiency) * (work in)

dividing by a unit of time gives =>

Power out = (efficiency) * (power in)

P_o = .91 * 4000 Watts = 3640 Watts

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A machine has an efficiency of 91 percent If the energy supplied to the machine is 4000 watts what is the amount being used for work?

The efficiency of the machine is 91%, so the amount used for work is 91% of the energy supplied. Amount used for work = Efficiency x Energy supplied = 0.91 * 4000 watts = 3640 watts.


A machine has an efficiency of 91 percent If the energy supplied to the machine is watts what is the amount being used for work?

If the efficiency is 91%, then work = 0.91 times watts


A machine has an effciency of 91 percent if the energy is supplied to the machine is 4000 watts what is the amount being used for work?

The efficiency of a machine is given by the ratio of useful work output to the energy input. Therefore, if the machine has an efficiency of 91%, the amount being used for work would be 91% of the energy input. In this case, if the energy supplied is 4000 watts, the amount being used for work would be 0.91 * 4000 = 3640 watts.


What do you need to know to calculate the efficiency of a machine?

To calculate the efficiency of a machine, you need to know the amount of useful work output produced by the machine and the amount of total energy input supplied to the machine. Efficiency is calculated by dividing the useful work output by the total energy input and multiplying by 100 to express it as a percentage.


If the energy supplied to the machine is 4000 watts for 91 percent efficiency what is the amount being used for work?

The idea here is to calculate 91% of 4000. By the way, technically "watts" is not a unit of energy. It is a unit of power - that is, energy per unit time.


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