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What is the efficiency of a device that gives you 10 units of useful energy for every 100 units you put in it?
Wiki User
∙ 12y ago
0.10, or 10%
Wiki User
∙ 12y ago
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What is the efficiency of a device that gives you 100 units of useful energy for every 100 units you put in it?
1
What does efficiency have to do with work and work out?
Efficiency = (Useful Work done)/(Total Work done).This is usually expressed as a percentage.Example:For every 200KJ of energy released from coal in a power plant, only 60KJ is converted to electrical energy. Therefore, Efficiency = 60/200 =30%.
What is the energy efficiency of a light bulb that gives you 30 units of useable energy for every 100 units of energy put into it?
30%
How much energy is wasted for every 1000 megajoule?
It depends on the efficiency of the appliance. If an electric motor has an efficiency of 0.7, then for every 1000 megajoules, 30 megajoules will be wasted as useless heat or sound or other useless energy form.
A machine puts out 100W of power for every 1000W put into it The effiency of the machine is?
The efficiency of a machine can be measured using the equation (Energy put out/Energy put in). In this case, the efficiency of the machine would be (100/1000), 0.1, or 10%. The efficiency can never exceed 100%, as then the machine would be creating energy from nothing! This is impossible, as can be seen from energy conservation laws. Energy is neither created nor destroyed, it is only transferred from one form to another. Because of the inefficiency of machines and mechanisms such as the one you described, energy is lost in a non-useful form every time the machine is used. This leads to the creation of low grade energy, which is useless to everyone as it cannot be re-used!
What is the efficiency of a device that gives you 100 units of useful energy for every 100 units you put in it?
1
What does efficiency have to do with work and work out?
Efficiency = (Useful Work done)/(Total Work done).This is usually expressed as a percentage.Example:For every 200KJ of energy released from coal in a power plant, only 60KJ is converted to electrical energy. Therefore, Efficiency = 60/200 =30%.
What energy transfers take place when you watch TV?
The main input energy is electrical energy from mains or power sockets; that energy is transferred to light energy for the pictures, and also there is sound energy (For audio), and all these energy are converted right back at heat energy as there is always a loss of energy in every device.
What is the energy efficiency of a light bulb that gives you 30 units of useable energy for every 100 units of energy put into it?
30%
How much energy is wasted for every 1000 megajoule?
It depends on the efficiency of the appliance. If an electric motor has an efficiency of 0.7, then for every 1000 megajoules, 30 megajoules will be wasted as useless heat or sound or other useless energy form.
What device transforms mechenical energy to electrical energy?
Every conventional electrical generator does that.
A machine puts out 100W of power for every 1000W put into it The effiency of the machine is?
The efficiency of a machine can be measured using the equation (Energy put out/Energy put in). In this case, the efficiency of the machine would be (100/1000), 0.1, or 10%. The efficiency can never exceed 100%, as then the machine would be creating energy from nothing! This is impossible, as can be seen from energy conservation laws. Energy is neither created nor destroyed, it is only transferred from one form to another. Because of the inefficiency of machines and mechanisms such as the one you described, energy is lost in a non-useful form every time the machine is used. This leads to the creation of low grade energy, which is useless to everyone as it cannot be re-used!
What is efficiency when applied to a machine?
Efficiency is the ratio of the useful work you can get out of the machine to the work you put in. It is always less than 100% because of losses due to friction, heat loss, wear and deformation. For instance the efficiency of a muscle in producing movement is between 14 and 27 %. To put it another way, for every 100 joules of chemical energy in the food we burn, only 14 to 27 % ends up as kinetic energy. Most of the rest is heat.
Is heat released from every transfer?
Energy always turns from useful energy to less useful forms of energy. so in theory the answer is no, but in reality there is always some heat generated in all transformations.
Need device that converts mechanical energy to thermal energy?
Almost every mechanical device converts some of its mechanical energy to thermal energy. Some examples I can think of at the moment are: -- drill bit -- saw blade -- file
Why every machine is device but every device is not machine?
Every orange is a fruit, but not every fruit is an orange. A knife is a device, but it is not a machine.
Your electricity meter seems stuck?
energy meter is a mechanic device. as every mechanic device it is subject to fatigue, and may fail. But generally, this is not such a bad news. In most cases, malfunction cause the energy meter to slow or get suck. what happens to the energy bill? you guessed it.
