### Electrostatics Basics

Introduction Electrostatics is a study of charge at rest.
1. What you need to remember is that this is all about the electron!
2. You must remember that the charge of a single electron is -1,6 x 10-19C.
3. You must also remember that the charge of a single proton is +1,6 x 10-19C.
4. All other objects become charged because of having extra or lesser electrons than protons.
5. You should think of charge as "weight". If the object is "charge heavy" it must have a lot of extra electrons!
6. If an objects charge is -1,6 x 10-19C then it has only ONE EXTRA electron.
7. If an objects charge is anything else such as, -5 x 10-15C then it obviously has a lot of extra electrons.

What are the things you need to learn?
1. Charge of one electron is Q = -1,6 x 10-19C
2. Charge of one proton is Q = +1,6 x 10-19C
3. How to work out new charges when charged objects make contact with each other.
4. Like charges repel, and unlike charges attract.
5. Use Coulombs Law to calculate the magnitude of these forces.
6. Draw Electric Field patterns.
7. Calculate Electric Field strengths.
8. Calculate Electrical Potential Energy.

Prefixes Since this section is full of all these small awkward numbers, prefixes are used where possible to represent the x 10power.

• Example 1
5 x 10-6C can be written as 5uC (pronounced microcoulombs)

• Example 2
-3 x 10-9C can be written as -3nC (pronounced nanocoulombs)

• Example 3
8 x 10-3C can be written as 8mC (pronounced millicoulombs)

You will pick up a few more as we go along. So you must become very good with your calculator! Get to know how to use your calculator by practicising a lot.