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: A question involvingn safe working voltage and capacitors?

  1. Oct 19, 2011 #1
    1. Problem Statement
    Some capacitors are marked 48uF, safe working voltage 25V.
    Show how a number of these capacitors may be connected to provide a capacitor of capacitance:
    a) 48uF, safe wroking voltage 50V
    b) 72uF, safe working voltage 25V

    2. Relevant Equations
    obviously C total in parallel = c1 + C2... and 1 / C total in series = 1/ C1 + 1 / C2

    3. Attempt at the Solution
    for part a) i thought you could have two of the capacitors in parallel, followed in series by another two capacitors in parallel for b) i didnt really have a clue, but perhaps two in series? (im probably wrong!)

    the answers state that for part a) "two capacitors in series", such that V < 25V across each capacitor.
    for part b)"two capacitors in parallel with a single capacitor"

    what is the safe working voltage??
    Last edited by a moderator: Oct 19, 2011
  2. jcsd
  3. Oct 19, 2011 #2
    Hint: what is the safe energy in the original capacitor set up?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook