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Homework Help: Voltage question

  1. Feb 13, 2006 #1
    My question is this: what voltage must a battery have to support 10A of current trhough a light bulb with resistance 6 Ohms.

    Is the answer simply found by: V = R x I ---- V = 6 x 10 = 60V

    I believe this is correct.

    Part II of my question is if you kept the same battery, but added a second light bulb in series, would the original bulb's brightness increase, decrease, or stay the same.
    I believethat the original bulbs brightness would decrease because there is still only one source of energy, the battery, powering 2 light bulbs.

    Can someone tell me if im on the right track. Thank you so much!
  2. jcsd
  3. Feb 13, 2006 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, you are correct.
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