# DC Electricity Review

One of the most important things in making sure that information is retained is to review it after learning. I got electricity down last week quite well, but haven't done a thorough review. So I decided to do the DC electricity test in Gibilisco's *Demystifying Electricity*.

The answer to the following problem (pg. 99) was e.

Seems to me like we may actually be able to figure this out:

E_{1} = (.07 A)(100 Ohms)

= 7 V

E_{2} = (.1 A) (100 Ohms) = 10 V

E_{tot} = 10 V + 7 V = 17 Volts

We know that the resistances of I_{3} and I_{4} are equal. The voltage will be split in two, and so the currents should be equal as well.

Thus,

V_{3} = V_{4} = 17 V/2 = 8.5 V

I_{3} = I_{4} = (8.5 V) / (100 Ohms) = 0.085 A

I've posted this question on openstudy.com for help.