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Max Network Voltage

  1. Apr 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Sorry, but i have another one that I can't get... :/
    A 2.94-kΩ and a 3.16-kΩ resistor are connected in parallel; this combination is connected in series with a 3.27-kΩ resistor. If each resistor is rated at 1/2 W, what is the maximum voltage that can be applied across the whole network?
    HELP: Find the maximum voltage and current each resistor can sustain.
    HELP: Parallel resistors have the same voltage across them; series resistors have the same current through them.


    2. Relevant equations
    P=IV=I2R
    Rtot(In parallel)=(R1-1+R2-1)-1


    3. The attempt at a solution
    I figured out that my total resistance is 4.793. I'm not quite sure if this has any bearing on the problem or not. I don't think so.
    Then I figured out that the max voltage on the 2.94 resistor would be 1.212V, 1.257 for the 3.16 resistor and 1.279 for the 3.27 resistor.
    From there I tried to use those to figure out the current (simply because it told me to, I don't see what it has to do with what I'm finding).
    Then I took the lower of the two voltages in parallel as the max that could be on those two, and added it with the voltage from the resistor they are in series with. this gave me 2.491. This is wrong and i have no idea where to go from here.
     
  2. jcsd
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