Brainscape's Knowledge GenomeTM

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


See full index

Electricity > Electricity > Flashcards

Electricity Flashcards

1
Q

Alternating current

A

Current what flows in one direction, then reverses flow. 60-cycle most common

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

Amperage

A

Heat setting; the strength of electricity; is responsible for deposition and penetration

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

Arc

A

Is created when there is enough amperage and voltage

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

Arc blow

A

Encountered during DC welding when the arc flares side to side. Caused by the current travellings in the same direction for a period of time.

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

How to minimize/eliminate arc blow

A

Change position of ground clamp, use different angle or inclination, weld toward a tack or weld, and use lower settings

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

Arc voltage

A

VOLTAGE output of the machine during welding. It’s the force that maintains the ARC between the electrode and workpiece

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

Buzz box

A

Describes AC transformer welding machine because of the typical buzzing sound made when welding

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

Circuit

A

System of conductors that is designed to complete the path of a current.

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

Core

A

Magnetic link between the primary and secondary Coils of a welding transformer

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

Coil

A

Made of insulated copper wire and is designed to have a certain number of turns.

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

Conductor

A

Is a material/substance that is capable of transmitting “conducting” electricity. Most metals are good conductors as they offer little resistance

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

Constant current

A

Type of direct current that maintains a steady current over time

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

Constant voltage

A

a power supply mode that maintains continuous voltage output, regardless of the load.

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

Current flow

A

Movement of electrons in an electrical current. Is measured in amperes. “How many amps are currently going through”

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

Cycle

A

Is one complete rotation of the sine wave pattern.

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

Diode

A

One way electrical valve. Allows current to flow though in one direction only. Used to change AC to DC

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

Direct current

A

Current that flows in one direction and has either positive or negative. Current flows from negative to positive

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

Duty cycle

A

NEMA - max output over a ten minute time period. 60% duty cycle = 6 minutes of weld time out of ten minutes.

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

Electron

A

Negatively charged partials that move through a conductor when current is flowing. “Negative to positive”

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

Frequency

A

Speed at which alternating current changes it’s direction of flow. “How fast it’s going”

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

Generator

A

Machine used to “generate” electricity

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

Inductance

A

Ability of a conductor to transfer current onto a neighboring body. “Charging phone pad”

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

Insulator

A

Any material that does not allow current to flow through it.

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

Inverter

A

Device that changes from DC to AC; increases the frequency

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

Line transformer

A

Another term to describe an AC transformer welding machine

26
Q

Magnetic field

A

Created when current is forced to flow through a coil that is wrapped around an iron core.

27
Q

Open circuit voltage

A

No current flowing through until an arc is struck.

28
Q

Rectifier

A

Devices that changes from AC to DC. Current flows in one direction only

29
Q

Relay

A

a switch that is operated by electricity to open and close circuits

30
Q

Resistance

A

Property of an electrical conductor to restrict the flow of a current. Turns electrical energy into heat.

31
Q

Reverse polarity

A

Electrode positive

32
Q

Straight polarity

A

Electrode negative

33
Q

Secondary coil

A

A coil of wire in a transformer that receives an induced current from a primary coil

34
Q

Switch

A

Device that breaks or completes an electrical circuit

35
Q

Voltage

A

Electrical pressure of force that causes current flow in a conductor; is called electromotive force; responsible for starting, maintaining an arc, fluidity and puddle flow

36
Q

Starting the arc

A

Needs 50 - 100 volts to initate an arc

37
Q

Arc voltage must be present in order to:

A

maintain an arc

38
Q

Puddle fluidity and flow

A

Arc voltage affects the width of the welding bead and fluidity or “wetness” of a puddle.

39
Q

Volt-amp curve

A

A graph that shows the curve of what

40
Q

Welding machine

A

Power sorce

41
Q

Dirct current electrode negative

A

Straight polarity

42
Q

Dirct current electrode positive

A

Reverse polarity

43
Q

Single phase power

A

Supply residential and small businesses. Current will change every 120 times per second

44
Q

Three phase power

A

Supplies larger commercial and industrial facilities. Sine waves peak and reverse resulting in fewer gaps in flow

45
Q

Three phase advantages

A

Constant power, smaller equipment, and more efficient. is the most common method used by electrical grids worldwide to transfer power.

46
Q

AC transformers

A

Takes electricity from the power grid and converts it into a welding current. Converts high voltage, low amperage to low voltage, high amperage. “Step down”.

47
Q

AC transformer advantages

A

Low cost, low maintenance, low operating cost, quiet, and no arc blow

48
Q

Ac transformer disadvantages

A

Not portable, no choice of polarity, limited electrode selection

49
Q

AC-DC transformer rectifiers

A

AC transformers with an added rectifier. Flows AC to DC only.

50
Q

AC-DC transformer rectifiers

A

Full selection of electrodes, choice of polarity, few moving parts

51
Q

AC-DC transformer rectifier disadvantages

A

More costly, arc blow is a factor, not portable, requires clean/cool environment

52
Q

Generator and alternator

A

Generators and alternators convert mechanical energy into electrical energy. Generator productes DC, alternator produces AC

53
Q

AC alternator advantages

A

No arc blow, maybe portable, higher duty cycle

54
Q

AC alternator disadvantages

A

High cost, high maintenance, noisier and narrow electrode selection

55
Q

DC generator/ alternator advantages

A

Choice of polarity, smoother arc, maybe portable, full choice of electrodes

56
Q

DC generator/ alternator disadvantages

A

High cost, high maintenance, noisier and arc blow is a factor

57
Q

Inverter

A

a device that “inverts” direct current (DC) to alternating current (AC)

58
Q

Inverter advantages

A

Small and lightweight, low input requirements, maybe cc or cv

59
Q

Inverter disadvantages

A

Noise, requires clean/cool environment, high cost, arc blow is a factor

60
Q

Welding machine installation and maintenance

A

Blow internal components with high volume, low pressure air as per manufacturer

Electricity (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions