Circuit Analysis of a diagram with series and parallel circuits

[joshqg]

Homework Statement

Find the current through and potential drop across each resistors

Relevant Equations

It=Vt/Req

I found the Req which is 13.6 and also found the It which is 0.74. I'm having trouble finding the separate current and potential difference numbers.

 

[gneill]

What circuit laws have you learned? Any particular circuit analysis techniques?

 

[berkeman]

Your Req is correct (well, I would keep more significant figures for more calculations). So now you know the current drawn from the 10V supply. That current flows through R1, so that gives you all you need to know about R1. Now calculate the Req for the resistors past R1 so you can see how the current divides between the two branches, and keep on going with the calculation. Please show your detailed work so we can keep checking it. Good so far!

 

[joshqg]

Your Req is correct (well, I would keep more significant figures for more calculations). So now you know the current drawn from the 10V supply. That current flows through R1, so that gives you all you need to know about R1. Now calculate the Req for the resistors past R1 so you can see how the current divides between the two branches, and keep on going with the calculation. Please show your detailed work so we can keep checking it. Good so far!

For I1 can I use 10V or do I need to find V1 by using the current I found? Also, to find Req for the other resistors do I need to add the 10 ohm and 5 ohm resistors and then solve the Req using the two parallel?

What circuit laws have you learned? Any particular circuit analysis techniques?

We've learned Kirchhoff's laws.

 

[gneill]

You've found the current that the 10 V supply delivers to the equivalent resistance of the network.

So you know that this current must be flowing though R1. What's the potential drop across R1? So what then is V_a:

If you know V_a, what's the current through R2 and R3+R4? And their potential drops?

 

[joshqg]

You've found the current that the 10 V supply delivers to the equivalent resistance of the network.
View attachment 255387
So you know that this current must be flowing though R1. What's the potential drop across R1? So what then is V_a:
View attachment 255388
If you know V_a, what's the current through R2 and R3+R4? And their potential drops?

The potential drop off across R1 is 3.7 V. The current through R2 is 0.185. The current through R3+4 is 0.25

 

[gneill]

The potential drop off across R1 is 3.7 V. The current through R2 is 0.185. The current through R3+4 is 0.25

Your potential drop across R1` is okay, but the other current values do not look good. What are you taking as the potential at node Va? It's certainly not the potential drop across R1!