# Need help with question......

Discussion in 'Homework Help' started by gregr, Sep 13, 2009.

1. ### gregr Thread Starter New Member

Sep 13, 2009
2
0
Here's the question, I have no idea what they are asking for an answer....

Any help is greatly appreciated.

Q#1- List all the resistance combinations possible using the three resistors 3, 9, and 18 ohms.

Q#2- Wheatstone bridge - Given R2/R1 ratio as 100 and known resistor 4.7 ohms. Find the unknown resistor.

2. ### mik3 Senior Member

Feb 4, 2008
4,846
63
Q1:

Find all the possible series, parallel and series-parallel combinations of the resistors values given (and maybe each combination result in a different equivalent resistance).

Q2:

Depending where the unknown resistor is located (high side or low side of the bridge):

100=4.7K/R

or

100=R/4.7K

3. ### studiot AAC Fanatic!

Nov 9, 2007
5,005
513
Q1 strictly don't forget to include the cases of only single resistors and two resistors. These combinations are possible because you could have a combination with all three but have one or two shorted out.