How can electrical appliance changes electrical energy to other forms of energy?

The details really depend on the electric appliance. Some common examples include:

  • Converting electrical energy to heat, in a resistance. This may happen in a heater, for example.
  • Using an electric motor to move things - for example in a fan, a mixer, and other appliances that involve movement.
  • Other types of appliances generate light by exciting atoms (as in a fluorescent light bulb or a LED), or sound, as in speakers.