Series and parallel circuits

  1. Hello,

    I was curious, if two resistors are separated by a battery (i.e. a circuit looks like battery -> resistor -> battery -> resistor), are the resistors in series? Similar idea with a capacitor.

    Also, are the resistors parallel if there is a junction that contains a battery and a resistor, and below it a single resistor?
     
  2. jcsd
  3. marcusl

    marcusl 2,138
    Science Advisor
    Gold Member

    Please provide sketches of your circuits so we are sure to follow.
     
  4. Ok here is a quick image I drew (I don't know where to get a circuit diagram drawer that is easy to use)
     

    Attached Files:

  5. marcusl

    marcusl 2,138
    Science Advisor
    Gold Member

    In the first case, YES they are in series. In the second diagram, the resistors are in series so far as battery #1 is concerned, as you have drawn it. You have a faulty diagram, however, since you have shorted out battery #2. I assume instead that you meant the bottom of battery #2 to connect to the node at far left where both resistors meet. In that case, the circuit is neither purely series nor parallel, but more complicated. The voltages and currents can be found by applying Kirchoff's laws, if you have come across those.
     
  6. So I guess the takeaway of this, is it the case that a capacitor and/or battery that is in between two resistors doesn't affect whether you consider them as being in series or parallel? For a capacitor, the current can't go through the air in between, so of course they don't have the same current, but are they still in series?
     
  7. sophiecentaur

    sophiecentaur 14,127
    Science Advisor
    Gold Member

    The terms 'series' and 'parallel' are not the be all and end all of circuit analysis. Don't get hung up on how to use them. The point of describing a pair of components as being 'in parallel' is when you are considering the way current splits between them. When you are considering two components 'in line' and how the voltage is shared between them, you use the term 'series'. In any particular circuit, it is often quite possible to treat two components as either series or parallel, depending on what you want to find out.
    Avoid the 'classification bug'.
     
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