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For more information, please see full course syllabus of AP Physics C/Electricity and Magnetism
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Lecture Comments (3)

0 answers

Post by Isaac Martinez on October 9, 2015

no sound or the last parts

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Post by Chase Lottinger on March 7, 2014

I just noticed the same thing as e b. Please fix!

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Post by e b on February 1, 2014

No sound at the clip 42:58.I hope this defect can be fixed.

RC Circuits

  • During the charging of a capacitor, the current in the RC circuit is given by

    I ( t ) = (V/R)*exp( -t / T)

    where V is the battery emf, R is the resistance, and T = RC is called the RC circuit time constant. On the other hand, the charge on the capacitor varies with time according to

    Q ( t ) = CV [1 – exp( -t / T)]

  • When a capacitor discharges through a resistance R, the charge on the capacitor decreases with time according to Q ( t ) = Q_initial *exp ( -t / T)

RC Circuits

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Charging a Capacitor: Circuit Equation 0:09
    • Circuit with a Resistance , Capacitance and a Battery
    • Closing Switch at T=0
    • Applying Kirchhoff's Rule
    • Change in Potential is Zero
    • Solution Tau dq/dt= ec-q
  • Discharging a Capacitor 27:14
    • Charged Capacitor Connect to Switch and Resistance
    • Closing the Switch at T=0
  • Example 36:50
    • 12V Battery with Switch and Resistance 10mili ohms and Capacitor Connected 10 Micro Farad
    • Time Constant
    • Charge at q=0 at t=1sec
  • Example 42:58
    • Switch With Capacitor and Resistance
    • What Time Charge C Has Initial Valve
    • How Long Charge Energy Stored in C to Drop Half of Initial Value
  • Example 1: RC Circuit 1
  • Example 2: RC Circuit 2
  • Example 3: RC Circuit 3