Electricil Engineering 101

http://i32.photobucket.com/albums/d46/SpeedstickX/Homework.jpg

I know this is basic, but it is confusing me. I only know how to do B, but I need to know A before I do it. And yes, this is homework. The above link shows the schematic. Does anyone here know this stuff?

A. Find total resistance (RT)

B. Find the current (I)

C. Find the current I4

D.Find the current I7

E. Find the voltage V7 (voltage across resistor 7)

The current is positively flowing, by the way.

Electrical*

A. is easy if you remember that resistors in series add:R1+R2; and in parallel it's 1/(1/R1+1/R2)
RT=R1+R3+1/(1/R2+1/(R4+R5)+1/(R4+R6+R7))
Rest should be easy enough from there.

homework fags is the cancer that is killing /sci/

>>5
truth

>>3

he is a enjinere not a spellamatician.

Um... how can you find the total current if you don't know total resistance... You can't find B with out A...So then to find individual currents its just total current flowing in to a junction is total flowing out, so i1=i4+i2, and you can tell how much goes to each by purportions, i.e. i4=i1*(R2/(R2+R4))...  and obviously i2=i1-i4.

so continue applying that idea untill you know all the currents (you should get i1=i3

then you know the current on R7  and the resistance so you can apply v=iR.



P.S. Physics>Engineering