1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Equivalent resistance of a circuit

  1. Feb 15, 2009 #1
    1. The problem statement


    The voltage is on the left (100V) and the jagged lines are the resistors in Ohms. I need to find the equivalent resistance of the circuit and after that the current flowing through the 4 ohm resistor.

    2. Relevant equations

    I = V/R

    3. The attempt at a solution

    I'm not sure if I calculated these correctly...

    Equiv Resistance = 7 + (10/2) + 8 + (4/2) + 3 = 25 Ohms.

    For the current flowing through the 8 ohm resistor, I = V/R = 100V/25ohms = 4 Amps
    Last edited: Feb 16, 2009
  2. jcsd
  3. Feb 16, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi dewdrop714! Welcome to PF! :smile:
    Looks good! :biggrin:
    8 ohm? :confused:

    Anyway, that's the current through the whole circuit … you need the current flowing through just the bit of wire containing the 4(?) ohm resistor. :wink:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook