Practice Quiz

AP Physics B Practice Exam

Category - Introductory Physics

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A student is turning the handle of a generator. Another student connects a bulb to the generator. The bulb lights up. The first student continues to turn the handle of the generator at the same speed, but finds it harder to turn. Which of the following best explains this?
  1. Less mechanical energy is required when the bulb is lit.
  2. More energy is put into the generator when the bulb is lit.
  3. Less mechanical energy is required the longer the generator is turned and the bulb is lit.
  4. The energy requirement of the generator is the same at any speed whether or not the bulb is lit.
Explanation
Answer: B - More energy is put into the generator when the bulb is lit.
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