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Capacitors in Series and Parallel. 20.12. Capacitors. A device that stores electric charge Two parallel plates separated by some distance q = CV E = ½ CV 2 Unit: Farads (F) Circuit diagram. Parallel Capacitors. Add the charges of the capacitors q = q 1 + q 2 = C 1 V + C 2 V = C P V

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Capacitors in Series and Parallel


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Presentation Transcript
capacitors
Capacitors
  • A device that stores electric charge
    • Two parallel plates separated by some distance
  • q = CV
  • E = ½ CV2
  • Unit: Farads (F)
  • Circuit diagram
parallel capacitors
Parallel Capacitors
  • Add the charges of the capacitors
  • q = q1 + q2 = C1V + C2V = CPV
  • CP = C1 + C2
series capacitors
Series Capacitors
  • All capacitors in series store the same charge regardless of their capacitances
  • The charge stored in the first charges the second by induction
  • V = V1 + V2 = q/C1 + q/C2 = q/CS
example
Example
  • An electric circuit was accidentally constructed using a 5.0 F capacitor instead of the required 16 F value. What can a technician do to correct this circuit?
  • Add a 11 F capacitor in parallel with the first one.
example 2
Example 2
  • You have three capacitors. How can you arrange them to give the greatest capacitance?
  • Parallel
  • Least capacitance?
  • Series
example 3

C2

C1

V

C3

Example 3
  • Determine the equivalent capacitance of the circuit shown if C1 = C2 = 2C3 = 12.5 F.
  • How much charge is stored on each capacitor when V = 45.0 V?
practice problems
Practice Problems
  • Test your capacitance for these types of problems
  • 616 P86 – 89
  • Total of 4 Problems