Question detail
Which of the following is an example of wasted energy in a light bulb?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Conservation and dissipation of energy
Question
- A. Electrical energy converted to visible light
- B. Electrical energy converted to heat in the filament
- C. Electrical energy used to power the switch
- D. Electrical energy stored in the bulb’s casing
Answer
Electrical energy converted to heat in the filament
Explanation
The correct option is "Electrical energy converted to heat in the filament". Electrical energy converted to heat in the filament is right because it directly matches Efficiency: Identify useful and wasted energy transfers in a device or process.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
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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