how do you find I and E when only Rt is given?

Discussion in 'Homework Help' started by pbandj, Feb 9, 2011.

  1. pbandj

    Thread Starter New Member

    Feb 9, 2011
    I have this series circuit. 4 resistors:
    R1=100 ohms
    R2=200 ""
    R3=400 ""
    R4=800 ""

    i have to find current and E but I'm not too sure how to do that when all that is given is that.

    My guess was to take Rt which is 1500 ohms divde it by 4 to get .002 and figured that was the I but I don't think thats right.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Notice that the equation is E = IR. With any two of the values, the third may be found. With only one given, about all you can do is say that for any E, I will be E/1500. Or, for any value of I, E will be I * 1500.