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Equivalent Capacitance of capacitors

  • Thread starter Ballin27
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  • #1
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Homework Statement



The equivalent capacitance of the capacitors shown in the figure is 9.26 uF

http://session.masteringphysics.com/problemAsset/1122585/1/Walker.21.58.jpg

Homework Equations



Cseries = 1/Cs = 1/c1 + 1/c2 + ...
Cparallel = Cp = C1 + C2 + ...


The Attempt at a Solution



Ceq = 9.26uF = Cseries + Cparallel

I am confused as to what I should do with the 12.0uF capacitor and the unknown capacitor. I assume that the 7.22, 4.25, and 8.35 are all in parallel?

Any and all help would be greatly appreciated, thanks in advance.
 

Answers and Replies

  • #2
gneill
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I am confused as to what I should do with the 12.0uF capacitor and the unknown capacitor. I assume that the 7.22, 4.25, and 8.35 are all in parallel?
No, those capacitors are not in parallel; for capacitors to be in parallel both of their terminal leads need to be directly connected.

You will have to work through the circuit in a series of steps, combining serial and parallel capacitances as they arise. To start off, combine the serial pair 12.0 and 8.35. You'll have to carry the unknown capacitance, C, as a variable as the simplification process incorporates it. Eventually you'll have to solve for it.
 

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