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Finding equivalent resistance

  • Thread starter sniderman
  • Start date
  • #1
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Homework Statement


Trying to find equivalent resistance between points a and b.Dont know whether to include resistances r5 and r6.

Thanks


Homework Equations





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

Homework Statement





Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
berkeman
Mentor
56,431
6,353

Homework Statement


Trying to find equivalent resistance between points a and b.Dont know whether to include resistances r5 and r6.

Thanks


Homework Equations





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

Homework Statement





Homework Equations





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?
 
  • #3
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0
i want to say that there is no current through those wires, because their not connected to anything making them open circuits?
 
  • #4
gneill
Mentor
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2,699
If no current flows through a component then it will not contribute to the resistance.
 
  • #5
4
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ok, but is there current flowing in r5 and r6
 
  • #6
gneill
Mentor
20,692
2,699
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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