Basics

Question 1

What is the unit of elementary charge? What is its measurement?

Answer 1

Coulomb (coo-lome); the charge on a proton (e) or electron (-e). (6.24 x 10^18 e) (e = 1.6 x 10^-19 Coloumbs)

Question 2

What is Coulomb’s Law? (what is the constant?)

Answer 2

(Force between two charges equals constant times first charge times second charge, divided by distance between them squared) F = (k * q1 * q2) / r^2 (constant is 9x 10^9 (N*m^2)/C^2 (Newtons times meters squared over coulombs squared))

Question 3

Do charges interact in a vacuum?

Answer 3

Yes!

Question 4

Think about electric fields. Why they look like dat?

Answer 4

The curved lines represent the direction a charge would be moving if it were in that spot. (This is not true, but it’s kind of a thing).

Question 5

What is another way to state N volts?

Answer 5

N Joules per Coulomb

Question 6

What is voltage?

Answer 6

electric potential between two points in space

Question 7

What is non-intuitive about current?

Answer 7

That we say it flows from positive to the negative, even though it is the negatively charged electrons that are actually moving

Question 8

What is current? What are two ways to describe its unit of measurement?

Answer 8

The flow (or change) of charge per second. Amp(ere)s, or Coulombs per second.

Question 9

Voltage v current?

Answer 9

Voltage is electrical pressure, the potential difference between negative and positive, how badly the electrons want to flow. Current is

Question 10

Ohm’s law?

Answer 10

V = I * R; V / R = I;