Answered

  1. What energy transformations occur in a battery-powered flashlight?
Aelectrical → mechanical → light
Bmechanical → sound → electrical
Cchemical → light → electrical
Dchemical → electrical → light


  1. What energy transformations occur in a hot air balloon?
Akinetic → mechanical → light
Bmechanical → sound → electrical
Cchemical → thermal → kinetic
Dchemical → electrical → thermal


  1. What energy transformations occur in a hydropower dam?
Akinetic → mechanical → light
Bmechanical → sound → electrical
Cpotential → mechanical → electrical
Dpotential → electrical → mechanical

Verified Answer :

Final answer:

The energy transformations in a battery-powered flashlight are from chemical to electrical to light energy. For a hot air balloon, energy transforms from chemical (thermal) to kinetic. In a hydropower dam, energy changes from potential to mechanical to electrical.


Explanation:

Energy Transformations

Energy transformations are essential concepts in physics, illustrating how energy changes form during different processes. Let's assess the energy transformations in each scenario provided:

  1. Battery-Powered Flashlight: In a flashlight, the energy transformation begins with chemical energy stored in the battery. When the flashlight is turned on, this chemical energy is converted into electrical energy. Finally, the electrical energy powers the bulb, converting it into light energy. Therefore, the correct answer is D. chemical electrical light.
  2. Hot Air Balloon: In the case of a hot air balloon, the energy transformation starts with thermal energy, which is generated by burning fuel (chemical reaction) to heat the air inside the balloon. This thermal energy then turns into kinetic energy as the heated air expands and decreases its density, allowing the balloon to rise. Thus, the correct answer is C. chemical thermal→ kinetic.
  3. Hydropower Dam: In a hydropower dam, potential energy from elevated water is the starting point. As water flows down through the dam, this potential energy is converted into mechanical energy when it turns turbines. Subsequently, the mechanical energy is transformed into electrical energy through generators. Therefore, the correct answer is D. potential mechanical electrical.

By understanding these transformations, we can appreciate how various forms of energy interact and contribute to practical applications in our daily lives.


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