In a series circuit, each load carries a current proportional to its resistance. therefore, the current varies for each load in the circuit?

I am not sure what you are asking but..:  A series circuit is a circuit with 2 or more bulbs or lights to light.  In a series circuit when you take out one bulb (or one goes out) the rest go out as well.  A parallel circuit is still multiple lights, but because of the way it is set up makes it so when you take out one bulb (or one goes out) all of the rest stay lit.