Heat energy
A microwave oven uses electrical energy (which is electromagnetic energy) from the mains, and it generates microwave energy (which is also electromagnetic energy) to heat/cook food items.
The electromagnetic energy (electricity) the oven operates on is being converted into mechanical (sound) energy when the timer beeps.
What kind of energy transformation does a microwave have
Microwave oven
heat energy
The input energy is electricity. The output energy (what does the cooking), is microwave radiation.
mechanical waves carry mechanical energy and electromagnetic waves carry electromagnetic energy.
electromagnetic energy
Electromagnetic
electromagnetic
Electromagnetic
The wave is called an electromagnetic wave.