physics doubt

[sweetie]

huh...how 2 and 1.??
please explain what you are trying to say

i meant why dont we consider the 2 resistors to the left of X( on the upper path) and the 1 resistor to the left of Y( the one on the lower path)

[astarmathsandphysics]

for q 36 it is not the restance between X and Y
you have to find the voltage at each point - there is 4V accross each resistor
it goes 0 4 8 12
so if wires are connected at diff poiint they will be at diff voltages and there will be a potential difference