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Finding equivalent resistance

by sniderman
Tags: equivalent, resistance
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sniderman
#1
Feb29-12, 07:32 PM
P: 4
1. The problem statement, all variables and given/known data
Trying to find equivalent resistance between points a and b.Dont know whether to include resistances r5 and r6.

Thanks


2. Relevant equations



3. The attempt at a solution
Im not sure what to do with the resistances r5 and r6in the open circuits are they apart of the calculations? i think they are not because nothing should be flowing threw them.
without them i got 1.6 ohms for a equivalent resistance
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
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berkeman
#2
Feb29-12, 07:45 PM
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P: 40,726
Quote Quote by sniderman View Post
1. The problem statement, all variables and given/known data
Trying to find equivalent resistance between points a and b.Dont know whether to include resistances r5 and r6.

Thanks


2. Relevant equations



3. The attempt at a solution
Im not sure what to do with the resistances r5 and r6in the open circuits are they apart of the calculations? i think they are not because nothing should be flowing threw them.
without them i got 1.6 ohms for a equivalent resistance
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
Welcome to the PF.

Imagine connecting a resistance meter (DVM) between points a and b. That will put a voltage across those 2 points, which will cause currents to flow in some of the resistors. If points c and d are floating during this measurement, will there be any currents through R5 and R6?
sniderman
#3
Feb29-12, 07:55 PM
P: 4
i want to say that there is no current through those wires, because their not connected to anything making them open circuits?

gneill
#4
Feb29-12, 10:11 PM
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P: 11,625
Finding equivalent resistance

If no current flows through a component then it will not contribute to the resistance.
sniderman
#5
Feb29-12, 11:09 PM
P: 4
ok, but is there current flowing in r5 and r6
gneill
#6
Feb29-12, 11:26 PM
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P: 11,625
Quote Quote by sniderman View Post
ok, but is there current flowing in r5 and r6
Where would it flow to? You need a CIRCUIT (closed path) for current to flow.


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