monday february 23
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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 - PowerPoint PPT PresentationTRANSCRIPT
Monday February 23
Lecture 15RC 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
25% 25%25%25%
1. A2. B3. C4. D
Which of the following combinations of capacitors has the lowest capacitance?
A B C D
25% 25%25%25%
1. A2. B3. C4. D
Which of the following combinations of capacitors has the lowest capacitance?
A B C D
25% 25%25%25%
1. A2. B3. C4. D
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
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)
At t = 0.01 s
• Q(.01) = Q(0)-I(0)*.01 = ?– What is Vc(0.01) ?
• Q(.02) = ?– Vc(0.02) ?
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
25% 25%25%25%
1. A2. B3. C4. D