lecture 11 - Problem 1 Two capacitors C1 and C2 are...

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Problem 1 – Two capacitors, C1 and C2, are connected in series and charged by a battery. Show that the energy stored in C1 plus the energy stored in C2 is equal to the energy stored in the equivalent capacitor, Ceq, when it is connected to the same battery.
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Problem 2 – A flash unit for a camera has a capacitance of 1500 μ F. What resistance is needed in this RC circuit if the flash is to charge to 90% of its full charge in 21 s?
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