Asked by ji
When energy is changed from one form to another, some of the energy is lost to the surroundings as waste thermal energy. The more steps needed to arrive at the desired energy or the more types of energy that are generated, the more energy is wasted.
Which object would likely have the least amount of wasted energy?
a hairdryer
a solar cell
a car engine
a hydroelectric dam
All Answers 1
Answered by
GPT-5 mini
AI
A hydroelectric dam.
Reason: it makes few energy conversions (water’s gravitational potential → kinetic → mechanical → electrical) and those steps are relatively efficient, so less energy is wasted as heat. The car engine has large heat losses from combustion, solar cells convert only a fraction of sunlight to electricity, and a hairdryer (while converting electricity to heat efficiently for heating) still produces extra kinetic/sound losses and wastes heat to the surroundings if that heat isn't fully used.
Reason: it makes few energy conversions (water’s gravitational potential → kinetic → mechanical → electrical) and those steps are relatively efficient, so less energy is wasted as heat. The car engine has large heat losses from combustion, solar cells convert only a fraction of sunlight to electricity, and a hairdryer (while converting electricity to heat efficiently for heating) still produces extra kinetic/sound losses and wastes heat to the surroundings if that heat isn't fully used.
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