Series Capacitor calculations

Discussion in 'Homework Help' started by gilbey, Jan 9, 2006.

  1. gilbey

    Thread Starter New Member

    Jan 9, 2006
    2
    0
    Really hope someone can help me here!

    I'm really struggling to understand the formulae used to express the capacitance or resistance of series capacitors or parallel resistors. I know it must be really simple but i just cannot understand how the text books get to the final figures!

    Say for instance you had 2 capacitors wired in series that were 10 μ F & 20 μ F how do i find the total capacitance for the circuit.

    Please help this is driving me insane, i keep just staring at the formulae feeling pretty dumb.

    Thanks
     
  2. pebe

    AAC Fanatic!

    Oct 11, 2004
    628
    3
    The formula for series capacitors is
    1/Ctot = 1/C1 + 1/C2 + 1/C3 ....etc where Ctot is the total value.

    In your case 1/C1+1/C2 becomes 1/10+1/20 which equals 3/20 . So Ctot = 20/3 = 6.66uF

    Resistors in parallel use the same formula - just replace C with R.
     
  3. gilbey

    Thread Starter New Member

    Jan 9, 2006
    2
    0
    thank you, i knew it was simple but for some reason it just wouldn't sink in
     
  4. mikeakarobinhood

    New Member

    Mar 6, 2008
    1
    0
    mad, thanx! my engineering test is tomorrow and this thread helped alot, its the only place i could find the capacitor formula in series. i registered just to say thanx, ill probly be on here alot more often now. ty:):):)
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
Loading...