Wood - Dry wood stores chemical energy. This chemical energy is released as the wood burns, and it is converted into heat, which is also called thermal energy, and light energy. As a result of burning, the wood turns into an entirely new substance – ashes. Explosives - When an explosive goes off, chemical energy that was stored in the explosive is changed and transferred into sound energy, kinetic energy, and thermal energy.
All of the energy that the person used to pull the string back is now stored in the elastic material of the bow. Energy stored like this is called potential energy. The bow is made of elastic "springy" material that is good at storing and releasing energy. 2. Arrow Released - Energy Transferred to Arrow In position 2, the archer has let go of the string.
Recent efforts to synthesize nanostructures with well defined geometrical shapes (e.g., solid and hollow spheres, prisms, rods, wires) and their assembly as 2- and 3- dimensional assemblies has further expanded the possibility of developing new strategies for light energy conversion.
Walking - or doing any effort with our muscles with that matter - converts chemical energy into mechanical energy. We get the chemical energy from the food we eat. Walking - or doing any effort with our muscles with that matter - converts chemical energy into mechanical energy.
Among these conversions (nuclear reactions) belong for example nuclear fission, nuclear decay and nuclear fusion. Conversions are associated with mass and energy changes. One of the striking results of Einstein’s theory of relativity is that mass and energy are equivalent and convertible, one into the other.
The amount of energy released in nuclear reactions is astounding. Table 1 shows how long a 100 Watt light bulb could run from using 1 kg of various fuels. The natural uranium undergoes nuclear fission and thus attains very high energy density (energy stored in a unit of mass).
 Shalabh Rakesh Bhatnagar ” converting sound energy to electric energy” International Journal of Emerging Technology and Advanced Engineering ISSN 2250-2459, Volume 2, Issue 10, October 2012. (Conference Paper)  Study of Piezo-electric device for conversion of sound. to electricity by Jamie Sue Rakin, University of Utah Oresto Symko.
In that case, the goal would be to convert thermal energy into electrical energy with as little loss as possible. In automotive design, thermal energy represents a challenge as well - the process of burning gasoline creates a great deal of energy that is not translated into vehicle motion or other useful functions.