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R3 and R4 are in parallel , do their Voltage equals to the cell? Or the voltage of RED and BLUE nodes are the same? Secondly,In picture above, it seem current would split up in Junction X and Y however the answer is two resistor in series.Why?

In the picture above R3 & R4 are in parallel R1 & R2 are in series When resistor are not in parallel, Are they must be in series? Thanks so much!

Hey thanks! What's the meaning of nodes?

How can i determine resistors are connected in parallel or in series? By current or potential.difference? The following are some complicated example..