- #1

- 51

- 0

## Homework Statement

How much energy must a 12V battery expend to fully charge a 0.15 uF and a 0.20 uF capacitor when they are (a) in parallel and (b) in series? How much charge flowed through the battery in each case?

## Homework Equations

i: C(eq)=((1/C1)+(1/C2)+...+(1/Cn))^-1 and C(eq)=C1+C2+...+Cn

ii: U=0.5CV^2

iii: Q=CV

## The Attempt at a Solution

I have worked it out but, I prefer not to post my answers. However, I did the following for (a) and (b):

1) Worked out the equivalent capacitance of each circuit using the appropriate equation (i)

2) Used the result(s) of part 1 and plugged that into equation (ii) using the voltage of the battery to get U for each circuit (energy expended by the battery solved)

3) Used the result(s) from part 1 and the given battery voltage in equation (iii) to obtain the charge for each circuit. (charge through battery solved)

So - that's essentially what I did. Was I correct in my methods? Thanks.