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: Circuits Problem

  1. Jul 30, 2011 #1
    1. The problem statement, all variables and given/known data

    A circuit with a resistor, capacitor, and inductor all connected in parallel with resistance = 5000 ohm, inductance = 1.25H and capacitance = 8nF, find the voltage across the components.

    2. Relevant equations

    v = L*di/dt, i = C*dv/dt, v = iR

    3. The attempt at a solution

    I'm not sure what to do, I tried both node-voltage and mesh current but can't get at a solution
  2. jcsd
  3. Jul 30, 2011 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Red_CCF! :smile:

    Don't we need some more information? :confused:

    What is the power supply (and if it's AC, what is the frequency)?
  4. Jul 30, 2011 #3

    Thanks for the response. I uploaded the problem with the drawing of the circuit. They just drew the three components connected in parallel, defined an unknown voltage across them and asked for the voltage response.

    Attached Files:

  5. Jul 30, 2011 #4


    User Avatar

    Staff: Mentor

    Presumably the "response" required will be that due to a unit step or impulse applied to the circuit.

    You should investigate the concept of damping for oscillations. You should be able to find the expression for the damping factor for the parallel RLC circuit and determine whether this circuit is underdamped, critically damped, or overdamped.
  6. Jul 31, 2011 #5
    Thanks very much. I completely forgot about the formula for RLC circuits
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook