1. Not finding help here? Sign up for a free 30min 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!

Sub-units micro-farad and pico-farad

  1. Mar 25, 2007 #1
    1. The problem statement, all variables and given/known data[/b]
    If the p.d across a capacitor is doubled, by what factor does the ehnergy stored change?

    Define the farad, the unit of capacitance. Explain the commonly used sub-units micro-farad and pico-farad.
     
  2. jcsd
  3. Mar 25, 2007 #2

    hage567

    User Avatar
    Homework Helper

    What have you done so far? Show your work. What equation might be useful for question #1?
     
  4. Mar 25, 2007 #3
    V = Q/C ? i dont really undersatnd the question
     
  5. Mar 25, 2007 #4

    hage567

    User Avatar
    Homework Helper

    That's not an equation for energy. You want [tex] U=(1/2)CV^2[/tex] where U is the stored energy, C is the capacitance, and V is the potential difference.

    It's asking if the potential difference is doubled, how much does the energy stored in the capacitor change. So using that equation, if you double V, what happens to U?
     
  6. Mar 25, 2007 #5
    ooh ok U doubles
     
  7. Mar 25, 2007 #6

    hage567

    User Avatar
    Homework Helper

    NO, look more closely. It's V squared, right?
     
  8. Mar 25, 2007 #7
    increase by 4?
     
  9. Mar 25, 2007 #8

    hage567

    User Avatar
    Homework Helper

    That's better.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Sub-units micro-farad and pico-farad
  1. Trig sub. (Replies: 5)

  2. Units ? (Replies: 4)

Loading...