# Unknown resistor value

Discussion in 'Homework Help' started by kwinterowd, Nov 28, 2011.

1. ### kwinterowd Thread Starter New Member

Nov 28, 2011
4
0
Need help finding value of R2
Voltage source 115, R1 and R2 are in parallel, R1 100Ω, R2 100mA, R3 is in series R3 150Ω. Should be easy but...

Dec 26, 2010
2,147
300
...But apart from the fact that we are not likely to supply direct answers for somebody's circuit theory homework, however basic, we are not mind-readers.

At the very least, post a schematic and explain your attempt to solve this. What is your difficulty with it?

3. ### kwinterowd Thread Starter New Member

Nov 28, 2011
4
0
R1 100Ω
+115v-- --R3 150Ω neg
R2 100mA
How do I calculate the resistance value of R2?

4. ### kwinterowd Thread Starter New Member

Nov 28, 2011
4
0
115vdc R1//R2 + R3.
R1=100ohm, R2=100mA, R3=150ohm
I will try type circuit here.
,,,,,,,,,,R1 100 ohm
+115v,,,,,,,,,,,,,,,,,,,,,,neg
,,,,,,,,,,R2 100 mA
I don't know how to get the ohm value for R2. The textbook isn't very clear. Thanks

5. ### kwinterowd Thread Starter New Member

Nov 28, 2011
4
0
Oops I forgot to put in R3
,,,,,,,,,,,,,,R1 100 ohm
+115v,,,,,,,,,,,,,,,,,,,,,,,,,,,,,R3 150 ohm
,,,,,,,,,,,,,,R2 100 mA

6. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
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