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!

Equivalent resistance if the values of the two resistances

  1. May 2, 2009 #1
    Two resistors are in series. Find the equivalent resistance if the values of the two
    resistances are as follows.
    a) 10 [Ω] and 20 [Ω].
    b) 100 [Ω] and 1 [MΩ] (M stands for “Mega” or million).
    c) 3.0 [kΩ] and 6.7 [kΩ] (k stands for “kilo” or thousand).
    d) 400 [Ω] and 1 [Ω].

    Repeat the above problem, assuming that the resistors are in parallel.




    Can anybody hel me with this, please? I have no idea how to start/do this. :confused:

    Thank you!
     
  2. jcsd
  3. May 3, 2009 #2

    Defennder

    User Avatar
    Homework Helper

    Re: resistors

    To start you off, what do you know about how to find equivalent resistance of resistors in series and parallel?
     
  4. May 3, 2009 #3
    Re: resistors

    parallel has the same voltage and the current in series stays the same?
     
  5. May 3, 2009 #4

    M11

    User Avatar

    Re: resistors

    Series resistors:

    Requivalent=R1+R2+R3+.......+Rn

    ______________________________________________________

    Parallel resistors:

    ( 1/ Requivalent) = ( 1 / R1) + ( 1/ R2) +........+ ( 1/ Rn)

    OR you can use the following equation if you have two parallel resistors:

    Requivalent=[tex]\frac{R1 \times R2}{R1 + R2}[/tex]
     
    Last edited: May 3, 2009
  6. May 5, 2009 #5
    Re: resistors

    So I just add them? a) would be 30 then.
    Thank you, that works:)
     
    Last edited: May 5, 2009
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Equivalent resistance if the values of the two resistances
  1. Equivalent Resistance (Replies: 8)

  2. Equivalent Resistance (Replies: 7)

Loading...