Energy Conversion: Where Does the Energy Come From?

In summary, when a helium balloon rises from rest, it gains both Ep and Ek. The energy for this comes from the density differential between the balloon and the air molecules. As the balloon rises, it displaces the air molecules, causing a decrease in their Ep which is converted to Ek that propels the balloon upward. This process also results in work being done on the balloon, giving it energy.
  • #1
elitewarr
63
0
When a helium balloon rises from rest, it gains Ep, at the same time, it gains Ek. So where does these energy come from?
My guess would be due to density differential, the balloon will rise and this will displace the air molecules which will fall to take the place of the balloon. This reduction of Ep of air molecules is converted to Ek, which pushes the balloon, causing work done on the balloon, thus giving it energy.
What do you think?
Thanks.
 
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  • #2
elitewarr said:
When a helium balloon rises from rest, it gains Ep, at the same time, it gains Ek. So where does these energy come from?
My guess would be due to density differential, the balloon will rise and this will displace the air molecules which will fall to take the place of the balloon. This reduction of Ep of air molecules is converted to Ek, which pushes the balloon, causing work done on the balloon, thus giving it energy.
You are exactly correct.
 
  • #3
Thank you for the fast reply :D
 
  • #4
DaleSpam said:
You are exactly correct.

Do you mean that a helium balloon gains Ep on ascent... No.

A helium balloon looses Ep during it's ascent and gains altitude.

E.g. By pulling a balloon down you expend energy while the balloon gains that energy as Ep.
 
  • #5
Lok said:
Do you mean that a helium balloon gains Ep on ascent... No.

A helium balloon looses Ep during it's ascent and gains altitude.

E.g. By pulling a balloon down you expend energy while the balloon gains that energy as Ep.
The balloon (treated in isolation) gains Gravitational Potential Energy - because it's higher - but the total system - including the air around it, loses Ep, for the reason given above.
 

Related to Energy Conversion: Where Does the Energy Come From?

1. What is energy conversion?

Energy conversion is the process of changing one form of energy into another. This can include converting energy from one source, such as the sun or wind, into electricity or converting gasoline into motion in a car.

2. Where does the energy come from for energy conversion?

The energy for energy conversion comes from a variety of sources, including renewable sources like the sun, wind, and water, as well as non-renewable sources like fossil fuels.

3. How does energy conversion impact the environment?

The impact of energy conversion on the environment depends on the source of energy used. Renewable sources generally have a lower impact as they do not produce greenhouse gas emissions and do not deplete natural resources. Non-renewable sources, on the other hand, can contribute to air and water pollution and can have negative effects on the environment.

4. What are some common methods of energy conversion?

Some common methods of energy conversion include combustion engines, solar panels, wind turbines, hydroelectric dams, and nuclear reactors. Each of these methods converts energy from a source into a usable form, such as electricity or mechanical energy.

5. How can energy conversion be made more efficient?

Energy conversion can be made more efficient by using newer technologies and more efficient processes. This can include using renewable sources of energy, improving the efficiency of existing systems, and implementing energy-saving practices. Additionally, research and development in the field of energy conversion can lead to new and more efficient methods of converting energy.

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