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Fig A3
Intuitively we can see that If the resistors are equal, the voltage will
drop equally across each resistor and so will be 2.5v in the middle [Fig A3].
Fig A4
If the R2 is made much smaller than R1 then the voltage will drop a
lot across R1, but not much across R2. This makes sense because as we make R2
smaller it becomes more like ordinary wire (which has nearly no resistance) and therefore
the voltage drop across R2 would eventually be almost nothing [Fig A4].
So, making R2 smaller 'pulls' the voltage between R1 and R2 down to 0v .
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