When energy is conserved or transferred and some of it becomes unavailable to do useful work, that energy is typically given off as heat. Therefore, the correct answer is:
It is given off as heat.
When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?
It is conducted.
It is completely destroyed.
It is given off as heat.
It is given off as microwaves.
3 answers
4. An electric fan is plugged into an outlet and the circuit completed, making the fan blades spin. Which of the following correctly describes this situation?
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1 point
Electrical energy is transformed into mechanical energy.
Mechanical energy is transformed into electrical energy.
Mechanical energy is destroyed, and electrical energy is created.
Electrical energy is destroyed, and mechanical energy is created.
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1 point
Electrical energy is transformed into mechanical energy.
Mechanical energy is transformed into electrical energy.
Mechanical energy is destroyed, and electrical energy is created.
Electrical energy is destroyed, and mechanical energy is created.
The correct description of the situation where an electric fan is plugged into an outlet and the fan blades spin is:
Electrical energy is transformed into mechanical energy.