Question

what energy transformation takes place in electric fan

Answer 1

  In an electric fan the energy conversion is as follows -
Electrical Energy ⇒ Mechanical Energy (Potential Energy + Kinetic Energy) and  Heat Energy .

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Answer 2

 energy transformation takes place in electric fan  ------------ >

electrical energy -------- > mechanical energy 

and also some amount of energy gets wasted as heat energy as all energy does not gets converted into mechanical energy but it obeys low of conservation of energy

here mechanical energy is rotating of blades