Identifying, Testing Combining RESISTORS

When you see a resistor, you want to know what its value, so you must know how to read it. After the assessment, I've learned that there are 2 main parts that you need to know.
I. Know how to calculate
SI Units are important, K is for Kilo, its means x1000
                                 M is for Mega, means x100000
                                 Another m symbol, its called Micro means x10^-6
and etc etc...

II Know how to read color codes
Don't panic, its easy!!! There are normally 2 types: 4 color codes and 5 color codes
With 4 color codes: the First 2 are numbers to take down eg. Brown/Red so is 12. The 3rd one is how many "zeroes" to add in eg,Brown/Red/Blue so 12 x 1000000(6 zeroes to add in). Just compare with the color code and better yet remember it.
The last color band you often see @ the end of it is gold or Silver, these are tolerance value means that you add or minus 10% or 5% of the calculated value.
5color codes, "same wine, but bigger bottle" the 3rd can also be taken down as a number, the 4th is the "ten-to-the-power-of-corresponding color".

III Series and Parallel
  Why resistance adds up in series, because same principal with water, 2 sequential resistor will be like 2 narrow stoppages, hence it is harder to flow. Rt=R1+R2+R3+...Rn
  Why in parallel, Rt behave accordingly to the formula . Simple, just like water if you have a path leading away to 2 path, eventhough there are resistances on each but, add those 2 paths 2gether, you'll get double flow, the total resistance will be 2 small proportionally to the series ones.

End of the story.