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Monday February 23

Monday February 23. Lecture 15 RC Circuits Electricity in the Nervous System. Capacitor Combinations. Slide 23-24. Which of the following combinations of capacitors has the highest capacitance?. A B C D. Which of the following combinations of capacitors has the lowest capacitance?. A

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Monday February 23

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  1. Monday February 23 Lecture 15 RC Circuits Electricity in the Nervous System

  2. Capacitor Combinations Slide 23-24

  3. Which of the following combinations of capacitors has the highest capacitance? • A • B • C • D

  4. Which of the following combinations of capacitors has the lowest capacitance? • A • B • C • D

  5. Which of the following combinations of capacitors has the lowest capacitance? • A • B • C • D

  6. RC Circuit • Charge or discharge a capacitor, C, through a resistor, R. • Start with discharge: See diagram • R=40,000Ω • C= 3000 μF • E = 3.0 V

  7. What current flows just after switch is closed (t=0)? • E = 3 V and Vc = 0, so I = E/R = 3.0/300=.01 A • What is charge on C at t=0.01 s? (approx)

  8. At t = 0.01 s • Q(.01) = Q(0)-I(0)*.01 = ? • What is Vc(0.01) ? • Q(.02) = ? • Vc(0.02) ?

  9. All capacitors have V0 = 5.0v at t=0 when switches are closed. Which has the lowest voltage at t = 1s? • A • B • C • D

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