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Electricity & Circuitry

  1. Apr 14, 2008 #1
    if i used batteries instead of a power source which circuit (series or parallel) would drain the batteries faster and why

    THank you.
  2. jcsd
  3. Apr 14, 2008 #2


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    Staff: Mentor

    The question doesn't make any sense - it sounds incomplete. Is this homework?
  4. Apr 14, 2008 #3
    well it's a lab question. I don't think that it's incomplete. It's simply asking whether a battery would run out of juice faster on a series circuit or parallel...something to do with the current and resistance properties of series/parallel Dc circuits
  5. Apr 14, 2008 #4
    Parallel circuit will drain faster, due to the lower resistance.
  6. Apr 15, 2008 #5
    I suppose you mean that the batteries are in series or parallel? It's still dependent on what the load is. if you use a resistor, the batteries in series will drain faster for any value of this resistor, but this is hardly a realistic situation.
    What is most interesting, is the efficiency, how much power is used for a given result, in light, heat, mechanical power etc. Answering this question in general isn't useful or interesting IMO.
  7. Apr 15, 2008 #6


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    Staff Emeritus
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    Homework Helper

    Assume the batteries are connected to a resistor, and figure out what the current

    through each battery is when the batteries are in series vs. parallel.

    The configuration with the higher current in each battery will drain them faster.

    p.s. if it helps you to use actual numbers, make the calculation easier by assuming 1V for each battery and a 1 ohm resistor.
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