Question detail
A refrigerator uses electricity to move heat from its interior to the outside environment. Explain why the energy transferred from the inside to the outside is considered wasted energy in the context of the refrigerator’s purpose.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Conservation and dissipation of energy
Question
A refrigerator uses electricity to move heat from its interior to the outside environment. Explain why the energy transferred from the inside to the outside is considered wasted energy in the context of the refrigerator’s purpose.
Answer
The energy transferred from the inside to the outside is considered wasted because it is not used to perform useful work; it merely removes heat from the refrigerated space, and the energy is dissipated into the surrounding environment without contributing to the refrigerator’s primary function of cooling.
Explanation
This question requires the student to apply the concept of wasted energy to a specific device, demonstrating understanding of how energy can be transferred in less useful ways.
Common mistake
Confusing useful and wasted energy
Students often label all energy moving through a device as useful, ignoring energy lost as heat or friction.
Explain that useful energy is that which performs the intended work (e.g., mechanical work, light, sound), while wasted energy is energy that leaves the system in less useful forms such as heat, sound, or vibration, and is not used for the device’s purpose.
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