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Batteries in series question

  1. Apr 17, 2015 #1
    Hey Guys, there is one question which is bugging me for the last couple of weeks. I am an embedded software engineer and when it comes to very deep understanding what is going it in the electrical circuits I struggle a lot. Recently I have decided to go through the course of physics again especially electrostatics and electrodynamics and being an engineer started asking questions to myself which never thought about when I was a student.
    One of the questions which I bumped into and can't find an answer is this one:

    Suppose I have two batteries connected in series. Why the voltages are added together.
    I understand roughly physics and electro-chemistry of how the battery works alone. But I am getting lost when
    two batteries are connected series. How do electrons get more potential energy?
  2. jcsd
  3. Apr 17, 2015 #2

    Simon Bridge

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    Welcome to PF;
    Same reason that if you put a hill on top of another hill the heights are added together.
    The electrons get more energy the same way that carrying a weight up both hills gets it more energy.
    Starting from the highest +ve side - the first battery lifts the electrons through V1 and delivers them to the +ve side of the next battery which lifts them a further V2 for a total of V1+V2.

    (Conventional charges go the other way...)
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