The correct answer to this question is Mechanical -> electrical. There are many devices that can transform mechanical energy into electrical energy. The most known is a generator. Generators can come in various sizes and can be small to supply power to a flashlight or larger to supply energy to businesses and cities. The concept of a generator was discovered by 19th century inventory Michael Faraday.
They are important espeically during times of storm when traditional power may go out. for they are able to create electric energy. Other devices that can perform this transformation include a hall effect, an alternator, piezo electric, and triboelectric.
Are you familiar with what an energy transformation is? You can already guess what this is based on its name. This may happen everywhere. There are some types of energy that will transform from one energy to another. It is kinetic energy that is known to transfer from one object to another.
Heat can transform into light. There are also instances when electricity can transform into motion. Your body may experience energy transformation often because you can get your energy from the food that you eat. When you do not get enough food, your body will consume your excess fat which might not be too good for the body.