# Series Parallel Problem

Discussion in 'Electronics Homework Help' started by usr13493n, Dec 28, 2018.

1. ### usr13493n

6
0
Dec 28, 2018
How can I find the equivalent resistance?
I tried R1||R5 R24|R3+R2 and R1-5||R2-3-4

2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,480
2,828
Jan 21, 2010
Since we can't see your circuit we can't tell.

A simple general solution is to find a pair of resistors either in series or parallel and replace then with a single resistance of the calculated combined value. Repeat this process until there is only one resistor left.

There are circuit topologies of resistors (I think the simplest has 5 resistors) where this process can't be used to completely solve it, but as I can't see your circuit...

3. ### Harald KappModeratorModerator

11,157
2,548
Nov 17, 2011
Remedy: upload a circuit diagram of how your resistors are connected using the 'image' button #15 from the left in the text entry's menu bar.

6
0
Dec 28, 2018

File size:
5.9 KB
Views:
18

6
0
Dec 28, 2018

File size:
5.9 KB
Views:
10
6. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,480
2,828
Jan 21, 2010
That circuit can't be simplified using simple formulae for resistors in series and parallel.

You need to employ another type of circuit analysis.

What other methods do you know?

7. ### AnalogKid

2,464
711
Jun 10, 2015
steve - in this forum is it ok to suggest a theorem by name without giving away the details?

8. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,480
2,828
Jan 21, 2010
I guess so. I was hoping the OP would volunteer what he has been taught.

9. ### usr13493n

6
0
Dec 28, 2018
Kirchhoff, Superposition Theorem, Series/Parallel, Current Divider, Voltage Divider and System equations

10. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,480
2,828
Jan 21, 2010
Can you apply KVL and KCL to this circuit? Did you learn to use this to determine all voltages and currents in a circuit?

11. ### usr13493n

6
0
Dec 28, 2018
I tried to use a System of equations using the Kirchhoffs Laws but nothing

12. ### Harald KappModeratorModerator

11,157
2,548
Nov 17, 2011
Try again. That is the way to do it. Find currents and voltages in the circuit, then use the current through the voltage source to find the equivalent resistance using Ohm's law.

13. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,480
2,828
Jan 21, 2010
Perhaps you can post the equations you derived and we can take a look at them. You may need to post any markup you've made on the original diagram if you have added any new non-obvious variables.