Re: Newbie: Series/Parallel DC circuit current question

Picture: http://img504.imageshack.us/img504/8222/drop117sz.jpg

The pic doesn't show how they come up with using 2/3. I can say 2 amps
enters the junction, splits 3 equal ways so we have .666 amps across
each branch but what about Ohms law ? If 90 volts is being applied at
junction A, then each 30 ohm resistor sees the 90 volts and again
90v/30ohms is 3 amps ? If I can't use Ohms law there, when will I know
to use it ?

.

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