2.1 Conduction of electricity

Question 1

What is a Coulomb (C)

Answer 1

The unit used for charge

Question 2

What is Electron charge (e)

Answer 2

A representation of charge in particle physics, where e = 1.6×10⁻¹⁹ C.

Question 3

What are Conductors

Answer 3

Materials that allow charge to flow through them.

Question 4

What are Insulators

Answer 4

Materials where charge cannot flow easily.

Question 5

What is Current (I)

Answer 5

The rate of flow of charge, measured in amperes (amps).

Question 6

What is the Current equation

Answer 6

I = ΔQ / Δt, where I is current, ΔQ is charge, and Δt is time.

Question 7

What is Charge carrier density (n)

Answer 7

The number of electrons per unit volume in a conductor.

Question 8

What is Mean drift velocity (v)

Answer 8

The average distance that electrons move in a conductor over time.

Question 9

What is Time to travel in conductor (t) equation

Answer 9

Given by the equation t = L / v, where L is length and v is mean drift velocity.

Question 10

What is Number of free electrons (N)

Answer 10

Calculated as N = n × A × L, where n is charge carrier density, A is cross-sectional area, and L is length.

Question 11

What is Electrons per second

Answer 11

The number of electrons passing through the end of the conductor per second, given by N = n × v × A.

Question 12

What is Current through conductor

Answer 12

I = nAve where n is charge carrier density, A is cross sectional area, v is drift velocity and e is electron charge 1.6×10⁻¹⁹ C.

Question 13

What is the Mean drift velocity equation

Answer 13

v = I / (n × A x e), where I is current, n is charge carrier density, A is cross-sectional area and e is electron charge 1.6×10⁻¹⁹ C.