Electrical energy changes to light and sound energy.
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Electrical energy is used to power the DVD player, which then converts the digital information stored on the DVD into audiovisual signals through a process of digital-to-analog conversion. These signals are then sent to the TV screen and speakers where they are converted into light and sound energy for us to see and hear.
In a DVD player, electrical energy is converted into various forms of energy throughout the device. The electrical energy powers the motor that spins the DVD, converting electrical energy into mechanical energy. The laser in the DVD player then converts this mechanical energy into light energy to read the data on the disc. Finally, the electrical signals generated by the laser are converted back into electrical energy to produce audio and video output.
The electromagnetic (EM) waves in a DVD player appear as light in the laser. The electrical energy the machine uses drives (among other things) a laser. The laser beam hits the reflective material on the DVD, and the reflected beam is modulated by that spinning, reflecting surface of the disc. The signal is seen and then demodulated into the audio and video. The transfer of energy could be seen as the transmission of EM energy (light) by the laser to the surface of the disc and its reflection from there to the photodiode that looks at the amount of reflected light.
When sunlight strikes a house, the energy transformation that takes place is from radiant energy (sunlight) to thermal energy (heat). The house absorbs the sunlight, which then gets converted into heat energy, warming up the interior.
The energy transformation that takes place is the conversion of one form of energy to another, such as kinetic energy to thermal energy, electrical energy to light energy, or chemical energy to mechanical energy. This conversion is governed by the laws of thermodynamics and is essential for all processes and activities in the universe.
In the engine of a typical train, the energy transformation that takes place involves converting the chemical energy stored in fuel (such as diesel) into mechanical energy through combustion. This mechanical energy is then used to move the train by powering the wheels.
When a lawn mower is used, the energy transformation that takes place is from chemical energy stored in the fuel (such as gasoline) being converted into mechanical energy that powers the movement of the mower blades. The mechanical energy is then used to cut the grass and do the work of mowing the lawn.
In a bicycle, the energy transformation involves converting the chemical energy stored in the body into mechanical energy by pedaling. This mechanical energy is then transferred to the wheels, where it is further transformed into kinetic energy to propel the bicycle forward.