9.1 Electricity

Question 1

9.1.1 Current

Answer 1

Current is the flow of charge carriers.

Question 2

9.1.2 The charge on Charge carriers is …

Answer 2

quantised and is always in multiples of the elemental charge based on how many electrons there are.

Question 3

9.1.2 What is the elemental charge?

Answer 3

it is the fact that an electron has a charge of -1.6 * 10^-19 Coulombs.

Question 4

9.1.3 What is the relationship between Charge, time, and Current?

Answer 4

Charge = current * time
Q = It

Question 5

9.1.4 What is the equation for drift velocity? and what does each component mean?

Answer 5

I = nAve where:
I = current (A)

n = number density of charge carriers (m^-3)

A = cross sectional area (m^2)

v = Drift velocity (m/s)

e = usually elementary charge 1.6 * 10^-19 or charge for each charge carrier (C) but can also be (q) charge of each charge carrier.

Question 6

Which way does conventional current go?

Answer 6

Positive to negative terminal, short end is the negative, long end is positive.

Question 7

Which way do the electrons flow?

Answer 7

negative to positive terminal, short end is the negative, long end is positive.