Because there are so many different values of numbers, it would be impractical to use 1Ω, 2Ω, 3Ω... etc... Using colored bands helps make reading it a little easier to the trained eye. There are hundreds of thousands, if not tens of millions of different resistors would need to exist to cover every value. So you just use something called "preferred values" with their resistance values posted on them instead.
They will repel one another because opposites attract, but like charges will repel.
The electrons will move more rapidly resulting in a higher pressure even at a consistent volume
Yes, they are the same. They are equivalent.
