Electrostatics & Electrodynamics

Question 1

If electrons are removed, an atom is

Answer 1

positive

Question 2

Addition of an electron to a neutral atom, causes the atom to be

Answer 2

negative

Question 3

What is an atom with too many or too few electrons?

Answer 3

an ion

Question 4

On what shell of an atom are the electrons bound most tightly?

Answer 4

K shell

Question 5

a quanity (expressed in kilograms)

Answer 5

mass

Question 6

shape or structure that gives it distinctive character

Answer 6

form

Question 7

the ability to do work (expressed in joules)

Answer 7

energy

Question 8

the branch of physics that deals with stationary or resting charges

Answer 8

electrostatics

Question 9

process of removing or adding electrons to a body of matter

Answer 9

electrification

Question 10

what is a neutral object that is always available to accept electric charges from an electrified object

Answer 10

earth

Question 11

3 methods of electrification

Answer 11

friction
induction
contact

Question 12

what is the removal of electrons from one object by rubbing it with another object

Answer 12

friction

Question 13

when 2 objects touch, permits electrons to move from one object to another

Answer 13

contact

Question 14

electrical fields acting on one another without contact

Answer 14

induction

Question 15

what type of electrification do we deal with when creating xrays

Answer 15

induction

Question 16

what are the 4 types of conductivity?

Answer 16

nonconductors or insulators
conductors
semiconductors
superconductors

Question 17

what type of conductor has no resistance to electron flow (it must be very cold)

Answer 17

superconductors

Question 18

what type allows free flow of electrons

Answer 18

conductors

Question 19

what type does not allow free flow of electrons

Answer 19

nonconductors or insulators

Question 20

the 5 laws of electrostatics

Answer 20

1. ) like charges repel, unlike charges attract
2. ) Coulomb’s law - the square of the distance
3. ) Electric charges reside only on external surfaces of conductors
4. ) the concentration of charges on a curved surface of a conductor is greater when the curvature is greater
5. ) only negative charges can move on solid conductors

Question 21

What is the unit of electric charge?

Answer 21

coulomb

Question 22

What is the unit of electric potential?

Answer 22

volt

Question 23

What is the unit of electrical current?

Answer 23

amperage

Question 24

What is the unit of electrical resistance?

Answer 24

ohms

Question 25

What is the unit of electrical power?

Answer 25

watt

Question 26

What is the unit of electrostatic force?

Answer 26

newtons

Question 27

What is the science of electrostatic charges in motion?

Answer 27

electrodynamics

Question 28

What are the 3 factors in electric current?

Answer 28

1. ) potential differences
2. ) current
3. ) resistance

Question 29

resistance depends on what 4 things?

Answer 29

1. ) material
2. ) length - increase length, increase resistance
3. ) cross-sectional area - decrease cross section, increase resistance
4. ) temperature - increase temp., increase resistance

Question 30

what law is the potential difference divided by the RESISTANCE?

Answer 30

Ohm’s law

Question 31

what is the formula for the power of electric current?

Answer 31

power = amp x voltage

Question 32

with what type of current do electrons flow in one direction?

Answer 32

direct

Question 33

with what type of current do electrons oscillate back and forth?

Answer 33

alternating

Question 34

Hertz is the _________

Answer 34

frequency