How Do I Calculate Equivalent Resistance Without Voltage?

[tlrmaus]

Homework Statement

What is the approximate equivalent resitance of the five resistors shown in the circuit show below?
http://img515.imageshack.us/i/circuit.png/

Homework Equations

The Attempt at a Solution

How do I solve this without voltage given?

 

[Abe21599]

equivalent resistance doesn't depend on the voltage. just add the resistors (using parallel and series) to obtain Req

also note its easier to start from the farthest point from the battery

 

[tlrmaus]

which ones would be in parallel and series? and what do you mean by starting from the farthest point of the battery? start at the 2ohms resistor?

 

[lorenb]

if the resistors are on the same "line" (no branches between them) they are in series.
-the equivalent resistance of the two resistors is the Sum (i.e. R1+R2)
if the resistors are not on the same "line" yet they share the same nodes. (i.e. they are connected to each other though a node on both sides). They are in parallel.
-the equivalent resistance of the two resistors is the product/sum (i.e. R1(R2)/(R1+R2).