if i want to calculate how much current my circuit draws when two resistors are connected in serie at 12VDC, I have to add the value of the two resistors ,before using ohms law, rigth[/u]
more current would be drawn since the equiv. resistance is 1/r1+1/r2=1/Rt
which is less than R1+R2 when they are in series.
and less resistance means more current drawn.
that depends on what are you trying to achive - define "better".
if you take everything out of your TV and connect it in series,
i don't think you would get significant improvements other than
chance to buy new one.
As already mentioned, it depends entirely on the circuit, you use serial or parallel connections depending on what you want to do - or just use a single resistor of the correct value.