Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Exposures II > chapter 3 - Electricity > Flashcards

chapter 3 - Electricity Flashcards

1
Q

Smallest unit of positive charge

A

Protons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Smallest unit of negative charge

A

Electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Free to move between orbitals and atoms

A

Electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What concerns the distribution and movement of electrons and has little to do with the positively charged protons locked within the atomic nucleus

A

Electricity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

zero, neutral (so there wont be shock)

A

grounding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Electric charges at rest

A

Electrostatics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Repulsion

A

Attraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Do like charges repel or attract

A

repel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Do unlike charges repel or attract

A

Attract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Force between two charges directly proportional to product of their magnitudes and inversely proportional to square of distance between them

A

Inverse square law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

where is grounding located

A

secondary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

-Charges reside on external surface of solid conductors
-attempt to repel each other due to negative charges

A

Distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

where will the greatest concentration of chargers gather

A

they will gather at the sharpest area of curvature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Charges move along surface of solid conductor

A

Movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What charges move along on solid conductor

A

Only negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Abrasion of two conductive materials creates a transfer of charges between the materials

A

Friction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Physically touching a charged body to a neutral body, creates a transfer of charge

A

Contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Bring a charged body in close proximity to a neutral object, without physical contact, creates a charge in the neutral object

A

Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

how to electrons move

A

high to low concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Occurs when one object is rubbed on another

A

Friction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Occurs when two objects touch
Permits electrons to move from one object to another

A

contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Releases excess energy as light photons

A

static discharge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Used in operation of electronic devices
Process of electric fields acting on one another without physical contact

A

Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Electrodynamics consist of :

A

Movement of electrons(negative to positive)
Electric current
Properties of conducting materials
Electrical circuit
Electron sources

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what is the flow of electrons

A

negative to positive
cathode to anode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Conventional current flow

A

From positive to negative
Due to movement of “electron holes” which is opposite to electron movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Quantity of electrons flowing

A

Current

28
Q

Force with which they travel

A

Potential difference (expressed as voltage)

29
Q

Direction of travel

A

Alternating current to Direct current (AC/DC)

30
Q

opposition to current flow

A

Impedance or resistance

31
Q

What is amperes

A

The current (how it is measured-unit)

32
Q

Quantity of electrons flowing
amperes is the unit

A

Current

33
Q

-Force that drives electrons
-Electromotive force (EMF)
-voltage
-area of higher to lower concentration of electrons

A

Potential Difference

34
Q

What current does the xray tube only operate on

A

xray tube can only operate on direct current

35
Q

what is needed to get direct current

A

Resistor

36
Q

what is the symbol for resistor

A

black triangle

37
Q

Resistance is dependent upon four things :

A

-materials conductivity
-length
-diamater
-temperature

38
Q

-amount of opposition to current
-measured in ohms
- based upon current type
-conductance (DC)
- Admittance (AC)

A

Resistance

39
Q

Valence band and conduction band overlap

A

Conductors

40
Q

Valence band and conduction band in close proximity

A

Semi-conductors

41
Q

valence band and conduction band overlap greatly

A

superconductors

42
Q

valence band and conduction band far apart

A

Insulators

43
Q

materials conductivity is dependents on configuration of atoms:

A

-valence band
-conduction band

44
Q

individual photon

A

kev

45
Q

kilovoltage peak

A

kvp

46
Q

what is the relationship between length and resistance

A

directly related

47
Q

why do electricians wire buildings using the shortest run possible ?

A

To lessen total resistance

48
Q

as length of solid conductor increase, what happens to resistance

A

increases proportionally

49
Q

what does the efficient circuit designs minimize ?

A

circuit pathways and length

50
Q

What is the relationship between diameter and resistance

A

inversely

51
Q

as cross sectional diameter of solid conductor increases, what happens to resistance

A

decreases

52
Q

what do thicker wires offer

A

less resistance

53
Q

how is the wire when the gauge number is lower

A

lower number, thicker wire

54
Q

what is the relationship between temperature and resistance

A

directly related

55
Q

what prevents electrons from flowing freely

A

increased atomic motion due to increased temperature

56
Q

what happens to resistance when there is an increase temp

A

decreased resistance
(dont want it to heat up - Electronics engineers go to great lengths to minimize circuit heat build-up)

57
Q

Ohms Law

A

V=IR
V= potential difference (volts)
I=Current (amperes)
R= resistance (ohms)

58
Q

Power

A

P=IV
P=power (watts)
I=current (amperes)
V=potential difference (volts)

59
Q

A generator converts what energy ?

A

Mechanical to electrical

60
Q

Current flow is divided between branches of circuit

A

Parallel Circuits

61
Q

What happens to total resistance, amperage and total voltage as more resistance is added to parallel circuit

A

As more resistances are added to a parallel circuit, total resistance drops, total amperage increases, and total voltage remains unchanged.

62
Q

Rheostat

A

Variable resistor

63
Q

Devices to circuits for protection

A

-circuit breaker
-fuse

64
Q

what happens to circuit temps when resistance is added in a parallel circuit

A

Increases circuit temps

65
Q

in what circuit do you add all the numbers together

A

series

66
Q

in what circuit do you take the lowest number and cut it in half

A

Parallel

Exposures II (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions