Voltage division question

Discussion in 'Homework Help' started by Henry Jyrkinson, Feb 17, 2015.

1. Henry Jyrkinson Thread Starter New Member

Feb 17, 2015
2
0
Hi here is my problem

So I need to solve Vout.

2. shteii01 AAC Fanatic!

Feb 19, 2010
3,297
482
Are R1 and R4 in parallel?

3. Henry Jyrkinson Thread Starter New Member

Feb 17, 2015
2
0
Yes they are.

4. MikeML AAC Fanatic!

Oct 2, 2009
5,450
1,066
Write a KCL equation for the current in/out of node(Vout).

5. crutschow Expert

Mar 14, 2008
12,573
3,082
You can also convert each parallel pair of resistors to the equivalent single resistance and solve the voltage from that.

6. WBahn Moderator

Mar 31, 2012
17,460
4,701
There's only one pair of resistors in parallel.

7. crutschow Expert

Mar 14, 2008
12,573
3,082
The op stated that R1 and R4 are in parallel.

8. WBahn Moderator

Mar 31, 2012
17,460
4,701
Yes. R1 and R4 are in parallel. Those are the ONLY two that are in parallel.

R2 and R3 are NOT.

9. crutschow Expert

Mar 14, 2008
12,573
3,082
You are correct of course. Silly me, as you might have guessed, I didn't closely look at what I thought were two ground symbols.

10. WBahn Moderator

Mar 31, 2012
17,460
4,701
We've all done it. And we will all do it again. And again.

11. Dodgydave Distinguished Member

Jun 22, 2012
4,796
708
Work out the parallel resistance, (20K) then remove the resistor to ground (R3),and work out the current across the 90V supply, then work out the voltdrop across R2, subtract the 30V and that should be it...

12. WBahn Moderator

Mar 31, 2012
17,460
4,701
On what basis are you removing R3?

13. JoeJester AAC Fanatic!

Apr 26, 2005
3,321
1,114
I'm sure glad Henry Jyrkinson will get a good grade after all the work he's done to solve this problem.

14. WBahn Moderator

Mar 31, 2012
17,460
4,701
Well, I guess we can give credit where credit is due -- he DID come back and answer one of the clarification questions that was asked. That's better than most!

He's also had to deal with some false hints, which can be frustrating but also very educational.

Still, I'm with you -- need to see some effort from him if there is much point going any further.