Electrons, waves, and photons: Charge and current

Question 1

what are the charge carriers in a metal

Answer 1

electrons

Question 2

what are the charge carriers in a liquid

Answer 2

ions

Question 3

what is the direction of flow of conventional current

Answer 3

from the positive to the negative terminal

Question 4

what is the direction of flow for the flow of electrons

Answer 4

from the negative to the positive terminal

Question 5

What is the value of the elementary charge (e) for a proton

Answer 5

+e +1.6x10^-19C

Question 6

What is the value of the elementary charge (e) for a neutron

Answer 6

0

Question 7

What is the value of the elementary charge (e) for an electron

Answer 7

-e -1.6x10^-19C

Question 8

Define electrical current

Answer 8

Current is defined as the rate of flow of charge

Question 9

what is the equation for current

Answer 9

I=∆Q/t

Question 10

What is current mesaured in

Answer 10

Amperes (A)

Question 11

What is a cathode

Answer 11

the negatively charged electrode

Question 12

What is an anode

Answer 12

the positively charged electrode

Question 13

What is a cation

Answer 13

a positively charged ion

Question 14

What is an anion

Answer 14

a negatively charged ion

Question 15

What is the equation for mean drift velocity

Answer 15

I=Anev

I = current

A = cross sectional area of wire

n is the number density of the material

e is the charge of an individual charge carrier

v is the mean drift velocity

Question 16

What is the approximate number density of insulators

Answer 16

10^4

Question 17

What is the approximate number density of semiconductors

Answer 17

10^17

Question 18

What is the approximate number density of conductors

Answer 18

10^28

Question 19

Describe the relationship between mean drift velocity and cross-sectional area

Answer 19

Mean drift velocity is inversely proportional to the cross-sectional area

v∝1/A

Question 20

What is the name of a liquid that carries current

Answer 20

An electrolyte

Question 21

what are the 2 types of electrolyte

Answer 21

molten metal/ionic compound

ionic solutions

Question 22

What is Kirchhoff’s 1st Law

Answer 22

the sum of currents into a point in a circuit is equal to the sum of currents out of the same point

Question 23

Describe the flow of electrons when no pd is applied

Answer 23

random movement of electrons

Question 24

Describe the flow of electrons when a pd is applied

Answer 24

random movement of electrons from the positive to negative terminals

Question 25

Define the Coulomb

Answer 25

The Coulomb is the charge passing through a single point in one second where there is a current of 1 Amp flowing