If it is already electrical energy, there is no need to convert something. It isn't quite clear what you want to convert.
battery
In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. A generator forces electric current to flow through an external circuit.
A cell aka battery.
By using an electric motor as its means of converting the electrical energy into motion.
electrical energy (in kWh) = electric power (in kWh) X time (in hours) E=Pt
Yes, because it is not 100 % efficient at converting electrical energy into kinetic energy.
Basically a big dip warmer, a resistive electric element.
Electricity does not occur in natural state. It has to be generated by converting one form of energy into electric energy. The electric energy of any machine can be calculated by subtracting the all losses occurring in a machine (electrical, mechanical and magnetic) from total input power or energy.
A chemical cell or strings of cells called a battery.
Motor is an example of converting electrical energy into mechanical energy
cell
we can convert sound waves to electric waves and by giving supply we can generate sounds to Piezo electric crystals or ceramics. The process of converting sound waves to electric waves with the help of peizo electric crystals is called peizo electric effect