# finding equivalent resistance

by sniderman
Tags: equivalent, resistance
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
Attached Files
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Mentor
P: 38,911
 Quote by sniderman 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?
 P: 4 i want to say that there is no current through those wires, because their not connected to anything making them open circuits?
P: 4

## finding equivalent resistance

help
 Mentor P: 11,206 If no current flows through a component then it will not contribute to the resistance.
 P: 4 ok, but is there current flowing in r5 and r6
Mentor
P: 11,206
 Quote by sniderman 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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