The big use of having lots of resistors (or sensors) is that we can use them to split up potential differences and channel them to a particular use.

http://techitoutuk.com/knowledge/electronics/buildingblocks/potentialdividers/

What you need to know is the formula for a potential divider and be able to apply it.

http://www.s-cool.co.uk/a-level/physics/kirchoffs-laws-and-potential-dividers/revise-it/potential-dividers

http://www.youtube.com/watch?v=Mn2i3DPI-a4

Questions and worked solutions can be found here: http://tap.iop.org/electricity/circuits/118/page_46038.html

Where this becomes really interesting is when we have a sensor (LDR, Thermistor) in the circuit but more of that later.

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