Charge and Current

Question 1

What is the definition of electric current?

Answer 1

The rate of flow of charge.

Question 2

What are the main equations revolving around charge?

Answer 2

Q=+or- ne
n is the number of electrons
e is the elementary charge

Q=It
I is current
t is the time

Question 3

Why might there be a larger current in a metal?

Answer 3

Greater number of electrons moving past a given point each second.
Same number of electrons moving faster through

Question 4

What is conventional current?

Answer 4

Current is always written from positive to negative but in metals the electrons move the other way.
so negative to positive.
This is called the electron flow

Question 5

What is the conservation of charge?

Answer 5

Electric charge can neither be created or destroyed.

Question 6

What is Kirchoffs 1st law?

Answer 6

For any point in the electrical circuit, the sum of the currents into that point is equal to the sum of the currents out of that point.

Question 7

What does the number density of a material determine?

Answer 7

How easily a material will conduct an electric current.

Question 8

What type of material group has the highest number density?

Answer 8

Conductors-10 to the power of 28
Semi Conductors-10 to the power of 17
Insulators-Negligible

Question 8

What is the definition for mean drift velocity?

Answer 8

The average velocity of electrons as they move through a wire.