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Resistors in parallel

Discussion in 'Electronics Homework Help' started by jjssj, Jul 17, 2012.

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  1. jjssj

    jjssj

    1
    0
    Jul 17, 2012
    How to find v1/2/3

    [​IMG]



    thnak you
     
    Last edited: Jul 17, 2012
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,592
    2,362
    Nov 17, 2011
    Look closely at the circuit. All resistors are connected to tha same voltage source. What voltage do they see?

    The problem with your math is here:
    3/2 = V1/6
    I assume that 3/2 means 3V (from the source)/2Ohm (total parallel resistance).
    But V1/6 is only the current through the 6 Ohm resistor, not the total current. Look up kirchhoffs laws and apply the rule for the sum ot all currents flowing in and out of a node to your circuit.


    If still unsure: think of the electric power in your house: how are the lamps connected to the system?
    Imagine having a single lamp. What happens, if you connect a second lamp in parallel? Does the brightness change?
    What happens, if you add the second lamp in series instead?

    Post your results, I will check them.

    Harald
     
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