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Posted:Mar 18, 2010
( Γ = 1/R)
See:
http://en.wikipedia.org/wiki/Resistor#Series_and_parallel_resistors
Example: A 220 ohm resistor and a 470 ohm resistor are wired in series. The combined resistance of these is 220+470 = 690 ohm.
Suppose these same resistors are wired in parallel. The combined resistance will then be 1/ (1/220 + 1/470) = 149.86 ohm
fig. 1)    (one minus sign = one resistor)
There is another configuration called parallel(see fig. 2) and the resistive values add inversely. 1/A + 1/B + 1/C
fig. 2) 


Additionally, there are more rules to deal with when it comes to power dissipation, amperage handling and such.