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!

Duration of Charging a capacitor

  1. Apr 2, 2013 #1
    How we calculate the duration of depositing a specific amount of charge via a battery on a pure Capacitor when resistance is not present..and we cant use the formulas of RC combinatio?
     
  2. jcsd
  3. Apr 2, 2013 #2

    BruceW

    User Avatar
    Homework Helper

    i'm not certain, but I think you'd need a quantum treatment, since that is essentially a superconductor.
     
  4. Apr 2, 2013 #3

    sophiecentaur

    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    This is an essentially classical problem. Resistance is never zero - even in a real circuit with superconductors in it. With low resistance, RC time constants can be very low but all circuits with a physical size will radiate EM power when the current is varying. This radiated power shows up as a resistance somewhere in your circuit so there is a finite value for the time constant.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook