Does a car burn more gasoline if its lights are tuned on?     No, the lights run from the electrical system, not from the engine.     Yes, if the engine is running, but when the engine is off, the battery runs the lights and it is separate from the engine.     Yes, all the energy used in the car eventually comes from the engine.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Conservation Of Energy
Section: Chapter Questions
Problem 35P
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Does a car burn more gasoline if its lights are tuned on?
   
No, the lights run from the electrical system, not from the engine.
   
Yes, if the engine is running, but when the engine is off, the battery runs the lights and it is separate from the engine.
   
Yes, all the energy used in the car eventually comes from the engine.
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