Electrons always have a charge of negative one. It's just a memorization thing. If it helps, imagine the three horizontal lines coming off the capital "E" in electrons as being the (-) negative sign.
you are right charges can never be at rest but the columbs law and electric field and other topics are being studied just imaginary, suppose that when charges are at rest they must emit a field which is called as electric field.
The easiest way to compare gas and electicity costs is to determine what your local electric company charges per kilowat hour and how much your local gas company charges per gallon. Average how long a gallon would last you per hour and compare that cost to the kilowat per hour charge.
the right way
When electrons are rearranged in an object by an electric field, the object is charged by gaining or losing electrons. If an object gains electrons, it becomes negatively charged, and if it loses electrons, it becomes positively charged.
The easiest way to separate a solid from a liquid is by filtration.
The easiest way to memorize a song is the read the lyrics while listening to the song
Practice makes perfect!
The fastest way to learn and do division is memorize your division math facts. It is easier to memorize the division facts, knowing your multiplication facts will help as well.
There is no easy way or really, any way at all to memorize an infinite list.
The easiest and the best way is to memorize every country on the map w.r.t its location. For exapmle, if started from Asia the memorize each country adjacent to other and carry on and consequently you will be able to memorize all the countries on the map. Source: http://www.datadubai.com/
The easiest way to memorize a long piece of writing is just to repeat it over and over. Start reading it out loud - yes, out loud does work better than just reading to yourself! - and after you read it 20 or 30 times (if you're paying attention when you read, that is) you'll know it!
Do you mean whether they attract or repel each other? That's just remembering that "opposites attract!" If you mean the electric charge on different atoms, you need a Study Deck - see the link - and just start memorizing.
There are many ways you can Memorize Stuff for a test as an example What I Would do Is Go Home From School And Memorize And Memorize Until I Know I Got It! Or I Would write it down multiple Times To Remember It!
IT IS USED IN RELIGIOUS AND NON RELIGIOUS CEREMONIES , it is a profession for some people , it is the easiest way to memorize things and it is also a mean of relaxation
Using a study deck is the best way -- aside from actually getting a job in a pharmacy. See the link to learn how to make a study deck.
The quickest and easiest way would be to make a Study Deck - click on the Related Question to see how to do that! - and put the county on one side of a card and the seat on the other. If you concentrate, you can memorize them pretty easily.
The easiest way to improve maths is to learn your tables, after you have mastered your tables you can start by doing algebra sums and rules and start to memorize them.