Electric fans are one of the needed things inside the house. How is energy changed when you plug the electric fan?

a.
When the electric fan is plugged, energy is changed from mechanical to electrical energy.


b.
When the electric fan is plugged, the energy is changed from electrical to wind energy.


c.
When the electric fan is plugged, the energy is changed from sound to heat energy.


d.
When the electric fan is plugged, energy is changed from electrical to

mechanical energy.