Hw Help Asap

Discussion in 'Homework Help' started by xxSOME1ELSExx, Mar 6, 2009.

  1. xxSOME1ELSExx

    Thread Starter New Member

    Mar 6, 2009
    KK i'm new i know but i need help with this problem


    There it is Click to make bigger

    I Already got the R3 and R4 Combined
    I dont have a value for R2
    I dont know how too get it

    Please help asap

    I procrastinated
    and i got class in 6 hrs still have to sleep
  2. vvkannan

    Active Member

    Aug 9, 2008
    Hi xxSOME1ELSExx,

    By KVL the sum of voltages across R1,R5 and R6 should equal 36.

    you know voltage across R6 and R1 (IR1 X R1) .subtract this from 36 and you will get the voltage across R5,divide this by R5 to get the current through R5.

    Subtract this from I total (30 ma) to get current through R2 (in series with
    R3||R4).Since this combination is parallel with R5 their voltages are equal.

    Divide this voltage by the calculated current to get the total resistance .

    subtract the value of R3||R4 you already got from the total value to get R2