Why must the total energy input to such a device always equal the total energy output?

1. What is the equation linking efficiency useful output energy transfer and total input energy transfer?
2. What is the total energy input?
3. What is the general rule for energy input in terms of fuel vs energy output in terms of electricity?
4. What is the ratio of useful energy to total input energy?
5. Why do devices waste energy?
6. When energy is transferred in a closed system what happens to the total amount of energy?
7. Is energy input equal to energy output?
8. Why do some fuels have higher output energy than others?
9. What does output energy mean?
10. Why is energy conservation important?
11. Why is energy development important?
12. What is energy conservation and why it is needed?
13. Why should we care about efficient energy conversion?
14. What is the most efficient energy conversion?
15. Why is energy conversion not 100 efficient?

What is the equation linking efficiency useful output energy transfer and total input energy transfer?

Efficiency = useful power out ÷ total power in.

What is the total energy input?

Input​ refers to the amount of energy put into a device, and ​ output​ refers to the amount of energy that comes out. ... Efficiency is the ratio of useful energy that comes out of a device to the total energy that went into it. Remember that energy cannot be destroyed, but it can be converted from one form to another.

What is the general rule for energy input in terms of fuel vs energy output in terms of electricity?

The First Law of Thermodynamics tells us that energy is conserved in all its transformations. So the ratio of energy output to energy input is always unity, or 100%.

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

Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radiation), or heat.

Why do devices waste energy?

Devices waste energy for various reasons, including friction between their moving parts, electrical resistance, and unwanted sound energy. ... Mechanical devices can be made more efficient through lubrication to reduce the friction between moving parts of a machine and increase the amount of useful energy transferred.

When energy is transferred in a closed system what happens to the total amount of energy?

When there are energy transfers in a closed system, there is no net change in the total energy in the system.

Is energy input equal to energy output?

However, the total amount of useful energy output of an isolated system is never equal to the total energy input. This is because some of the input energy will be lost as dispersed heat as it is processed. ... There will always be energy lost to the surroundings and energy lost due to friction.

Why do some fuels have higher output energy than others?

The amount of energy released is dependent on the oxidation state of the carbons in the hydrocarbon which is related to the hydrogen/carbon ratio. The more hydrogen per carbon, the lower the oxidation state and the more energy that will be released during the oxidation reaction.

What does output energy mean?

'Input energy' is the amount of energy going into a system. 'Output energy' is the amount of energy going out of a system.

Why is energy conservation important?

Why Is Energy Conservation Important? Energy conservation is incredibly important for several reasons. Along with reducing our reliance on non-renewable energy resources (like fossil fuels), it also helps save you money on energy costs, including utility bills and other energy bills.

Why is energy development important?

Energy is the key input in economic growth and there is a close link between the availability of energy and the growth of a nation. Since energy is essential to conduct the process of Production, the process of economic development requires the use of higher levels of energy consumption.

What is energy conservation and why it is needed?

Energy conservation is the effort made to reduce the consumption of energy by using less of an energy service. ... Energy conservation measures (ECMs) in buildings reduce the need for energy services and can result in increased environmental quality, national security, personal financial security and higher savings.

Why should we care about efficient energy conversion?

Using energy more efficiently is one of the fastest, most cost-effective ways to save money, reduce greenhouse gas emissions, create jobs, and meet growing energy demand. ... Environmental: Increased efficiency can lower greenhouse gas (GHG) emissions and other pollutants, as well as decrease water use.

What is the most efficient energy conversion?

In theory, direct chemical to electrical energy offers the highest efficiency: it can deliver arbitrarily close to 100% efficiency. However, to date, fuel cells haven't delivered on anything close to that promise. In theory, the worst way to do it, in efficiency terms, is to go via heat - e.g. by burning the fuel.

Why is energy conversion not 100 efficient?

This means that when energy is converted to a different form, some of the input energy is turned into a highly disordered form of energy, like heat. ... Energy losses are what prevent processes from ever being 100% efficient.