Question

part b
electrical energy is used to turn the blades of a fan. the amount of energy transformed is seen here: 750 j electrical energy is transformed into 400 j kinetic or mechanical energy. what happened to the remaining 350 j of energy?
a it was lost due to friction
b it was transformed into 350 j of heat energy
c it was destroyed by the rotating blades of the fan
d it was never used and therefore was not transformed

Explanation:

According to the law of conservation of energy, energy cannot be created or destroyed. In the operation of a fan, some of the electrical energy that is not converted into kinetic - mechanical energy is transformed into heat energy due to resistance and friction in the motor and other components. Option A only mentions friction but does not clearly state that it is transformed into heat. Option C violates the law of conservation of energy. Option D is incorrect as all the input electrical energy is either transformed or dissipated in some form.

Answer:

B. It was transformed into 350 J of heat energy