What is Energy conversion: Definition and 82 Discussions

Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work (e.g. Lifting an object) or provides heat. In addition to being converted, according to the law of conservation of energy, energy is transferable to a different location or object, but it cannot be created or destroyed.
The energy in many of its forms may be used in natural processes, or to provide some service to society such as heating, refrigeration, lighting or performing mechanical work to operate machines. For example, to heat a home, the furnace burns fuel, whose chemical potential energy is converted into thermal energy, which is then transferred to the home's air to raise its temperature.

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  1. H

    From fluid energy conservation equation to the continuity equation

    Hey there, First of all, all energy conservation equations for a fluid I found on google hadn't the ##\gamma## coefficient. What exactly is the difference? Secondly, by substituting e by ##e = \frac{1}{\gamma -1} \frac{p}{\rho}## in the following equation ##\frac{De}{Dt} + (\gamma - 1)e \nabla...
  2. nav888

    Conservation of Energy when lifting a box up off the floor

    So, I cannot for the life of me write a conservation of energy statement, when an object is lifted up by a force. So in my example there is a box on the floor with v = 0, and then a force of magnitude F, where F > mg, acts on the ball, now the net force is F-mg, and hence the work done is (F -...
  3. J

    I How do we calculate the energy we used to do something?

    Usually, I like to take a physical approach to phenomena that occur in everyday life. But I feel difficult to solve problems because I don't have higher education My question stems from this question (What's the difference between running up a hill and running up an inclined treadmill?), which...
  4. cnh1995

    Engineering Electromechanical energy conversion problem

    Here, I have assumed very quick movement of the moving part. So, as per the mmf-flux curve, flux linking with the system will be unchanged during the movement. To support this assumption, I have made use of the following analysis. In this graph, the movement of the part happens quickly (small...
  5. Al-Layth

    Mechanism Ideas for: Rotary Action-input Pump?

    I'm trying to come up with a design for a handheld pump that will be used to suck diesel from a car's fuel tank. There's definitely going to be a pipe dipping into the fuel tank, and there's definitely going to be a human manually operating the pump. I'm trying to think of a mechanism that...
  6. S

    Confusion about energy conversion mechanisms in gas turbines

    Hello Gents, I am very confused about the working principle of gas turbines. I understand that air is first compressed in a compressor to obtain high pressure air at the inlet of turbine, but before air is introduced to the turbine, first it has to be heated to very high temperatures through...
  7. A

    Principle of Nuclear Fission Direct Energy Conversion

    Good day everyone, I've recently been researching direct energy conversion schemes for nuclear fission, and I have a question on the basic physics behind the device (specifically on how it converts kinetic energy to electricity). In essence, the "basic" scheme for fission DEC devices is that...
  8. L

    How Is Converted Electrical Energy Stored and Utilized?

    Hello, I am interested in the circuitry of energy conversion, such as solar, thermal, etc. How does the converted electrical energy get stored, for example, do they use supercapacitors? How does it then get applied for general use? Do you have any documentation or circuit diagrams for this?
  9. A

    Understanding Klystron Energy Conversion and Impedance Transformation

    A while back I made a thread which helped me even though it went sideways at the end, now I have one (maybe few) questions.1) So in a klystron, the current running in the output cavity torus as the bunched electron beam passes through the output cavity center is directly proportional to the...
  10. BethNB

    I Could tide-powered buoyancy be a viable source of energy?

    Hi all, this is my first post. It seems around eight years ago I was on a similar brain-wave-length as Laurence Kemball-Cook, with his idea to create a power generating flooring surface... only he had the know-how to bring the idea to market, so credit where credit is due. (though now I wonder...
  11. Kaneki123

    B A Question about Energy conversion....

    Okay...Suppose we we lift up something from the ground upto a certain height. By doing so, we have imparted it some potential energy. If we now let go, it will start converting its potential energy to kinetic energy.Now, suppose we apply this analogy to the case of a positive charge place nearer...
  12. S

    Research Topic suggestions for "nanostructured materials for solar energy conversion"

    I have selected a topic for my research work which is "nanostructured materials for solar energy conversion" I have read many of articles, most of which are about Li batteries but I want to do something new. Anyone who's in this field suggests something new.:smile:
  13. G

    I Scintillation photon energy conversion?

    Hello, I read that in a scintillator before the photomultiplier tube is a crystal or sometimes gas or even sometimes a plastic, in other words a material which exerts luminosity under ionizing radiation. Say in the doped crystal for example, a high energy photon of say several Mev hits the...
  14. X

    B C as Energy Conversion Constant: Conservation Law Explained

    I was thinking about the law of conservation of energy, states that energy can neither be created nor destroyed. Then I thought about it more broadly, it actually states that the universe was created with a fixed amount of energy (and this energy only transforms from one form to another) And...
  15. C

    Energy Conversion Homework: Equations and Attempt at Solution

    Homework Statement Homework EquationsThe Attempt at a Solution I'm quite new to these chapters and I can't seem to get my head around the theory and especially this question. That's the solution above. Where does the T_max = 1/8... equation come from? I understand that the mechanical work...
  16. V

    Examples of conversion of gravitational PE to heat energy?

    Homework Statement I was looking for some examples where gravitational potential energy is converted to heat energy. Are there many such examples of this conversion? I could only come up with one such example and even that could be an incorrect example. Homework Equations PEg = mgh The...
  17. rfranceschetti

    Engineering Mech engineering work in nuclear reactors

    Hi all, I would like to know what's the kind of work a mechanical engineer has to perform when being part of the team encharged of building a fusion or a generic nuclear reactor. I find many areas in mechanical engineering attractive, but I believe that fusion reactors have great potential in...
  18. I

    I Increasing solar energy conversion efficiency

    You can burn a hole in paper using a magnifying glass and light. What would happen if you applied this large-scale on a solar panel?
  19. J

    Solar Energy Conversion at Night

    This is a fun thought experiment; Why not have space based mirrors to reflect light down to Earth at night to make solar do a little extra generating! The cost of solar is coming down and the cost of lifting things into orbit is coming down, so why not. Plus gold is very reflective, light...
  20. Benign Paradigm

    I Energy Conversion With Supercritical Fluids

    Technically, this isn't a question concerning supercritical fluids. It's more about converting thermal energy into velocity by playing "keep-away" with molecules that want to go supercritical. The idea is simple. In an fully contained system, we can more or less say volume is static...
  21. R

    Energy conversion in a spring SHM

    Homework Statement Looking for some feedback a) Describe the energy conversions in a spring undergoing simple harmonic motion as it moves from the point of maximum compression to maximum stretch in a frictionless envoirnment. Be sure to point out the points at which there will be I) maximum...
  22. G

    Using Solar panels for energy conversion?

    Hi guys I am working on a project in which i use solar panels to drive a pair of headphones my main question is what kind of solar panels would you guys recommend? that could help with this kind of project
  23. N

    Back:EMF and energy conversion in a PMSM

    I'm seeking comments & opinions on a couple of statements I've come across in a book: "A textbook of electrical technology" https://books.google.co.uk/books?id=1lR701DFtaMC&pg=PA997&source=bl&ots=9XfjSFr7cR&sig=KK_WAbdNVCdCWUWiHUxUrtcpjug&hl=en&sa=X&ved=0ahUKEwiI9MH7ntTKAhXDRhQKHalHBEAQ6AEIHzAD...
  24. L

    Limit on mechanical & electric energy conversion efficiency

    I regret to say that I know little of engineering, but, to make a long story short, I'm nagged by two questions about energy conversion efficiency. There is a thread i made titled "giant railguns recycling their own energy in space" in the science fiction & fantasy forum here that explains my...
  25. nathan mcgrath

    How can photons be used to manipulate matter and create fire?

    Hi people. I'm currently well into my 4th novel, 'The Atlas of Elegance.' it's a book about magic - but a kind of magic based around physics, in particular quantum and astrophysics. The main characters in the story have the ability to control matter at a sub-atomic and quantum level. I'm using...
  26. P

    How do I find rotational energy for a pulley system?

    Homework Statement So I have a horizontal pulley positioned at the edge of table with a mass of .2kg hanging down from a height of .76meters, the other end of the string is attached to a wooden block of mass .25kg that when the .2kg weight is dropped the wooden block is pulled towards the...
  27. S

    Direct energy conversion from p+Li-7 fusion reaction?

    I have a question about direct energy conversion; if I want to directly extract electrical energy from the fusion reaction p+Li-7 reaction which generates He nuclei, with a kinetic energy of 8 MeV, what is the most suitable method of doing that? Should some method with charge separation be used...
  28. R.Mesri

    How much energy is produced during thermal expansion?

    We say the expansion coefficient of steel is 12 × 10 -6 m/m°C, Young's modulus 210 × 109 N/m2 and yield stress 250 mega Pascal. With 100 meters length and 0.1 m2 section area , If we increase its temperature 10 °C, how much energy will be produced by expansion force in Joules? with young's...
  29. Sampad Saha

    How does Potential Energy converted into Kinetic Energy? ?

    As we know that every object that has kinetic energy could also have potential energy. Now suppose an object is in rest at a distance of h meter from ground so it has some potential energy and no kinetic energy, now if it starts to fall towards the ground can we say that its total potential...
  30. F

    Electric Potential Energy Conversion

    Hello everyone, Imagine two points that have a Electric Potential Difference of 10V and they are connected through a conductor wire. Let's call these points A and B: Now imagine we have a charge on A of 1C. To move the charge to B, we need to make a work of 10J, right? So, now, imagine the...
  31. M

    How do vibrations in a solution affect other particles?

    Hi, I was wondering if someone can explain to me the following. If I have a vibrating molecule in a solution, what effect would this vibration have on other particles in my solution which are different. Can the vibration be the same for them if they are not excited (do not vibrate due to...
  32. P

    Question about the Penrose process

    Can anyone tell me how energy created via the Penrose process can be extracted and converted into useable energy? What kind of infrastructure would we need on Earth, in space, etc.? Many articles talk about how energy can be created through the Penrose / Blandford–Znajek process, but none...
  33. alison16

    Friction and Energy Conversion

    Homework Statement A 1100kg car is traveling at 24m/s before it hits a 18m patch of mud with a 1.7 x 10^4 net horizontal resistive force. What is the cars speed as it leaves the mud patch? Homework Equations Change in Uint= fd KE= 1/2mv^2 W= Fd The Attempt at a Solution 1/2mv^2 = f(mud on...
  34. T

    Neutron Capture in Hydrogen Fusion Reactor

    A recent issue of Aviation Week described a novel design for a fusion reactor from the Lockheed Skunk Works. It was smaller, simpler and lighter than the extant systems now being built and they're optimistic about it's test run in five years. I wrote a letter to the editor touting this departure...
  35. K

    Nuclear fission and nuclear to thermal energy conversion

    Homework Statement [/B] Suppose the main water pipe breaks in a nuclear power plant, shutting off the water flow. If the control rods fall immediately into place, stopping the chain reaction, is there still a problem? Yes, because radioactivity continues to create lots of thermal energy. (A)...
  36. J

    Thermal and Kinetic Energy Conversion

    A man is running and chemical energy converts to thermal and kinetic. The output (thermal and kinetic ) has the same amount of energy as the input (chemical). But what does thermal and kinetic energy convert to?
  37. T

    Energy conversion efficiency (Light -> heat)

    Hi, all I'm seeking advice on how to calculate the energy conversion efficiency, in case of heat from light energy. I think that one of the general formulas 'energy output/energy input' can not be applied in this problem. Assuming that light(or laser) has 10W power output and material 1...

    Issue with energy conversion in synch. machine

    Hello, Assume a synchronous generator is running unloaded and has a fixed input power for any given short time frame (which is a practical consideration for electric power plants). When an electrical load is applied, the machine slows down. I understand this.. what I don't understand is the...
  39. K

    Energy conversion in a hydroelectric dam

    (this is the first time I post. hope this is in the correct board) So I want to know about how the internal energy of water has been converted into electrical energy when the turbine is rotating at a steady speed. I have read several textbooks and they all give me several answers: 1. GPE of...
  40. T

    How Is the Spring Constant Calculated for an Acrobat's Safe Landing?

    Homework Statement A very short 100 kg acrobat steps off a 10 m high platform and starts falling. The acrobat falls 9 m, then encounters a 1 m long spring connected at one end to the ground below. (a) What’s the spring constant so the acrobat just touches the ground (that is, so the...
  41. P

    Energy conversion efficiency of each bounce

    1. i drop a ball (mass 20 grammes) from a height of 10 meters, after 3 bounces it rises to a height of 2 meters, what is the energy conversion efficiency of each bounce? 2. I've been stuck on this for the last hour and have nothing any help would be great. 3.the closest i got was...
  42. Z

    Energy conversion with constant velocity

    This is just a very simple conceptual question. Say that someone is going down an escalator at a constant velocity. They are losing GPE, but not gaining any KE. So where is this potential energy going? Same with going up, they're gaining GPE, but not losing any KE. On a similar note, say...
  43. B

    Energy conversion difference in permanent magnet vs. field coil motor

    New here, hello all. My question is more about the field magnet in a running DC motor. First of all, does the current required to maintain a magnetic field change with the load on the motor? And if so, where would this "extra energy" come from in a permanent magnet DC motor?
  44. H

    Two battery hooked up in series, energy conversion

    Homework Statement The positive terminals of two batteries with emf's of V_1 and V_2, respectively, are connected together. It is V_2>V_1. The circuit is completed by connecting the negative terminals. If each battery has an internal resistance r, what is the rate with which electrical...
  45. D

    Can Energy Conversion Ever Reach 100% Efficiency?

    Hi there people, I have a doubt, if you convert all energy has an expense which makes it is always converted less than 100 percent for example kinetic energy turning electrical energy turning 90 percent of electrical energy, there was a loss of the energy that I'd like to know and if for example...
  46. R

    How does back emf make energy conversion possible

    I've come across one thing about energy conversions: "To make an energy conversion possible, it is important that the supplied form of energy must be opposed by another force, otherwise this energy cannot be converted." Agreed! Once the motor starts generating torque, a back emf is produced...
  47. R

    How is energy converted in a ball rolling down a ramp and triggering a switch?

    Energy Conversion Explanation I have a ball behind suspended at the top of a ramp. The ball rolls down the ramp and triggers a switch. The switch is connected to a 9V battery and a motor and turns on once the switch is pressed. The motor acts as a fan because it has "blades" attached to it...
  48. C

    Converting Joules to MeV: Understanding Energy Conversion

    Hello all, How many MeV is .000000000000081 (8.1*10^-14) joules?
  49. A

    Energy conversion in a closed system?

    We wrap a light, flexible cable around a thin-walled, hollow cylinder with mass M and radius R. The cylinder is attached to the axle by spokes of a negligible moment of inertia.The cylinder rotates with negligible friction about a stationary horizontal axis. We tie the free end of the cable to a...