Finding equivalent resistance

Homework Statement

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

Thanks

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

The Attempt at a Solution

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berkeman
Mentor

Homework Statement

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

Thanks

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

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?

i want to say that there is no current through those wires, because their not connected to anything making them open circuits?

gneill
Mentor
If no current flows through a component then it will not contribute to the resistance.

ok, but is there current flowing in r5 and r6

gneill
Mentor
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.