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!

An RC Ciruit

  1. Oct 4, 2007 #1
    If a charged capacitor c=35 micro farads is connected to a resistor R=120 ohms how much time will elapse until the voltage falls to 10^6/D of its original max value?

    Ciruit contains a switch, resistor, emf and a capacitor in series.

    Relevant equations are Time constant= T=cR and V(Final)=V(initial) e^-t/cr

    I think it requires logarithms but i am not sure.

    Can you please help me how to answer this.
  2. jcsd
  3. Oct 4, 2007 #2
    Another question is:

    A circuit containing a switch, Vo, a capacitor and a bulb in series.

    The capacior is originally uncharged. Describe the behaviour of the bulb from the instant the switch is on until a long time later.

    I think there will be a delay for the bulb to emit light and then it will emit light getting slowly brighter as the capacitor is getting charged up.

    Is this right???
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: An RC Ciruit
  1. An RC Ciruit (Replies: 1)

  2. Paralel Voltage Ciruit (Replies: 2)

  3. Capacitive Ciruit (Replies: 8)