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Just A Hint Please?

  1. Jun 15, 2009 #1
    The headlights on a car operate typically at 60 W and the parking lights
    typically at 5 W. Assuming there are two main headlights and four parking lights,
    what length of time will it take to discharge a 60 Ah battery, if the
    lights are left on?

    I'm trying to practice my problem solving skills, but I'm just a bit suck here. Could someone please offer me a hint? No solutions of course.

    Would I add the the power of all the lights together?
  2. jcsd
  3. Jun 15, 2009 #2


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    Science Advisor
    Homework Helper

    Yes power adds.
    You also need to know the current taken by the lights, (P=IV)
    And the typical voltage of a car battery.
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