The process of conversion of energy from its initial to another form is called energy conversion. The fan is converting the electrical energy into sound energy. Thus, option D is correct.
Energy conversion has been said to be a process that transforms or converts the initial energy form into the final energy. The conversion just involves the transfer without any loss of energy.
A fan uses electrical energy to move and produce wind through its motor and blades. The movement of the fan is due to the electrical energy but the air or wind produced is mechanical energy.
When the air is produced by the rotating blades the sound of air is produced as a result of the sound energy. The sound energy is involved in the sound or noise produced.
Therefore, option D. the fan produces air with noise due to the conversion of electrical energy into sound energy.
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