3. When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?

Question

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1 point
It is conducted.
It is completely destroyed.
It is given off as heat.
It is given off as microwaves.
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.
5. What is the main type of energy conversion taking place?
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1 point
Captionless Image
Thermal energy is converted to mechanical energy as the energy from heat provides energy for movement.
Mechanical energy is converted to thermal energy as the energy from movement creates heat in the surrounding air.
Chemical energy is converted to mechanical energy as the energy from digested food provides energy for movement.
Mechanical energy is converted to chemical energy as the movement from movement creates reactions in the surrounding air.

Answer 1

3. When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?
   Answer: It is given off as heat.

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?
   Answer: Electrical energy is transformed into mechanical energy.

5. What is the main type of energy conversion taking place?
   Answer: Mechanical energy is converted to thermal energy as the energy from movement creates heat in the surrounding air.