Electrostatics and Electrodynamics

Question 1

the primary function of x-ray imaging system

Answer 1

to convert electric energy into electromagnetic energy

Question 2

study of stationary electric charges

Answer 2

Electrostatics

Question 3

T/F Matter has mass and energy equivalence

Answer 3

True

Question 4

T/F Matter also may have electric charge

Answer 4

Ttrue

Question 5

positive or negative
has potential energy

Answer 5

Electric Charge

Question 6

smallest units

Answer 6

proton and electron

Question 7

fundamental unit of electric charge

Answer 7

C (Coulomb)

Question 8

1 C : […electron charges]

Answer 8

6.3x10¹⁸

Question 9

an object that has too few or too many electrons

Answer 9

Electrified

Question 10

the process of adding or removing electrons from an object

Answer 10

Electrification

Question 11

Electrification is created by [..]

Answer 11

contact, friction, induction

Question 12

process of making ferromagnetic material
magnetic
[process of generating current in a conductor by placing it in a changing magnetic field]

Answer 12

Electrification by Induction

Question 13

a phenomenon whereby surfaces become electrically charged by touching

Answer 13

Electrification by Contact

Question 14

charging process results in a transfer of electrons between the two objects that are rubbed together

Answer 14

Electrification by Friction

Question 15

the object that behaves as a reservoir for stray electric charges

Answer 15

Electric Ground

Question 16

EXPLAIN Electrostatic Laws

Answer 16

Unlike charges attract
Like charges repel
Electric field radiates OUT from POSITIVE charge
Electric field radiates TOWARD a NEGATIVE charge
Uncharged particles DO NOT have electric field

Question 17

the lines of force exerted on charged ions in the tissues by the electrodes
it causes charged particles to move from one pole to another
+ = OUT
- = TOWARD

Answer 17

Electric Field

Question 18

Laws of electrostatics

Answer 18

1. unlike charges attract; like charges repel
2. Coulomb’s law
3. electric- charge distribution
4. electric-charge concentration

-charges uniformly distributed in -surface
- sharpest curvature of surface

Question 19

EXPLAIN Coulomb’s Law

Answer 19

electrostatic force is directly proportional to the product of the charges
inversely proportional to the square of the distance between them

Question 20

Coulomb’s Law formula

Answer 20

F = k(QₐQb/d²)
F - electrostatic force
k - constant of proportionality [8.99 x 10⁹ N m²/c²]
QₐQb - charges
d - distance (m²)

Question 21

k [constant of proportionality]

Answer 21

8.99 x 10⁹ N m²/c²]

Question 22

T/F Electric charge distribution is uniform through or on the surface

Answer 22

True

Question 23

SI Unit: Volt (V)
1V:1J/C or 1 potential energy/unit charge

Answer 23

Electric Potential

Question 24

Study of electric charges in motion

Answer 24

Electrodynamics

Question 25

People who work with electric current

Answer 25

Electrical engineer

Question 26

 people concerned with current flow

Answer 26

Physicist

Question 27

The four states of electric matter

Answer 27

Conductor, Insulator, semiconductor, superconductor

Question 28

Any substance through which electrons flow easily

Answer 28

Conductor

Question 29

Characteristics of a conductor

Answer 29

Variable resistance Obeys Ohm’s law Requires voltage

Question 30

Examples of a conductor

Answer 30

Copper (Z = 29), aluminum (Z = 13) & water

Question 31

Any materials that does not allow electrons flow

Answer 31

Insulator

Question 32

Characteristics of insulator

Answer 32

Does not permit electrons flow extremely high resistance necessary with high voltage

Question 33

Examples of an insulator

Answer 33

Glass, rubber, and clay

Question 34

Any material that storm conditions behave as an insulator and as a conductor

Answer 34

Semiconductor

Question 35

Characteristics of a semiconductor

Answer 35

Can be conductive can be resistive basis for computers

Question 36

Examples of semiconductors 

Answer 36

Silicon (Si-14) and Germainium (Ge-32)

Question 37

material that allows electrons to flow without resistance

Answer 37

Superconductor

Question 38

Characteristics of a  Superconductor

Answer 38

No resistance to electron flow no electric potential required must be very cold

Question 39

Examples of a Superconductor

Answer 39

Niobium (Nb-41) and titanium (Ti-22)

Question 40

Demonstrated semi conduction [person, year]

Answer 40

William Shockley 1946

Question 41

The property of some matter to exhibit no resistance below a critical temperature

Answer 41

Superconductivity 1911

Question 42

The path of electron flow from the generating source through the various components and back again

Answer 42

Electric Circuits

Question 43

T/F Increasing electric resistance results in a reduced electric current

Answer 43

True

Question 44

The flow of electrons through a conductor Direction is always opposite to the electron flow

Answer 44

Electric current/electricity

Question 45

Electric current/electricity is measured in […]

Answer 45

Amperes (A) 1 A: 1C/s or 1 Electric charge/second

Question 46

It is measured in volts (V) 1V: 1 J/c or 1 potential energy/unit charge

Answer 46

Electric Potential

Question 47

measured in Ohms

Answer 47

Electric resistance

Question 48

The voltage across the total circuit or any position of the circuit is equal to the current times the resistance V=IR

Answer 48

Ohms law

Question 49

Ohm’s Law formula

Answer 49

V=IR R=V/I I=V/R

Question 50

Two basic types of electric circuits

Answer 50

Series circuit and parallel circuits

Question 51

one circuit elements are connected in a line along the same conductor

Answer 51

Series circuit

Question 52

Rules for a series circuit

Answer 52

1. The same current flows through each part of a series circuit. It= I1 = I2 = I3 2. The total resistance of a series circuit is equal to the sum of individual resistances. Rt=R1+ R2 + R3 3. Voltage applied to a series circuit is equal to the sum of the individual voltage Vt= V1 + V2 + V3

Question 53

Elements are connected at their ends 

Answer 53

Parallel circuits

Question 54

Rules for parallel circuits

Answer 54

The total parallel circuit current is the sum of the individual branch currents It= I1 + I2 +I3 The voltage across each component in a parallel circuit is the same. Vt= V1=V2 =V3 The reciprocal of the total resistance is equal to the sum of the reciprocals of the individual resistances. 1/Rt= 1/R1 + 1/R2 + 1/R3

Question 55

Inhibits flow of electrons

Answer 55

Resistor 

Question 56

Provides electric potential

Answer 56

Battery

Question 57

Momentarily stores electric charge

Answer 57

Capacitor

Question 58

Measures electrical voltage

Answer 58

Ammeter 

Question 59

Measures electric potential

Answer 59

Voltmeter

Question 60

Turn circuit on and off by providing infinite resistance

Answer 60

Switch

Question 61

Increases and decreases voltage by fixed amount (AC only)

Answer 61

Transformer

Question 62

Variable resistor

Answer 62

Rheostat

Question 63

Allows electrons to flow only in one direction

Answer 63

Diode

Question 64

Electrons that flow in only one direction

Answer 64

Direct current

Question 65

Electrons that flow alternatively in opposite direction (60-Hz)

Answer 65

Alternating current

Question 66

Graphic representation of a wave x-axis:time y-axis: amplitude of electric current  AC: sinusoidal DC: straight line

Answer 66

Waveform 

Question 67

measured in Watts (W) 1 W: 1A x 1V

Answer 67

Electric Power

Question 68

Electric Power formula

Answer 68

P=IV P=I^2R

Question 69

T/F Electric charge of a conductor is concentrated along the sharpest curvature on the surface

Answer 69

True