# Determine the total current in the attached diagram

Hope this is posted in the right place:

Determine the total current in the attached diagram

R parallel = 1/9.7 + 1/43 = 0.366^-1 = 2.98ohms
R series = 4.3 + 7.4 = 11.7ohms
R total = 2.98+11.7=14.68ohms

I=V/R
= 30/14.68
= 2.04A

The answer given is 4.67A, what am I doing wrong?

Thanks,
Devon

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mfb
Mentor
R series = 4.3 + 7.4 = 11.7ohms
Where does 7.4 come from and what is in series here?

If you use a number not given in the problem statement, please explain where it comes from.

There are more things in parallel.

My apologies the 7.4 ohms should be where the second 4.3ohms in series is on the attached sketch. I drew that up late last night.

CWatters
Homework Helper
Gold Member
Hint: There are actually three resistors in parallel.

• DevonZA
Hint: There are actually three resistors in parallel.
I see only 2?

Aha thank you CWatters I see that the 7.4ohm resistor is in fact in parallel.

Itotal=Vtotal/Rtotal
Rparallel = 1/9.7 + 1/4.3 + 1/7.4 = 2.12ohms
Rseries = 4.3ohms
Rt = 2.12 + 4.3 = 6.42ohms

It=Vt/Rt
It = 30/6.42
It = 4.67A

CWatters
• 