- #1

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## The Attempt at a Solution

I realize that Work = Energy. And by using U = .5CV^2 I can easily come up with the answer.

But when I first started doing the problem, I tried doing it by a more convoluted approach--which made sense to me, but I got the wrong answer. I just wanted to know why the following way of solving the problem doesn't also work:

W = U (energy)

V = 3 V

C = 7.8 x 10^-6 F

Using the equation C = Q/V, I solved for Q (charge). Q= 2.34 x 10^-5 C.

Since W = QV, I multiplied (2.34 x 10^-5)(3) = 7.02 x 10^-5 as my answer (which is wrong). I wanted to know what is wrong with my reasoning, so I don't make the same mistake again.

Thank you.