Electricity

Front 1

This term describes a noisy, uncontrollable are that flares from side to side.

Back 1

Arc blow

Front 2

This term describes the influence exerted by a magnetic field on a neighboring bodies without physical contact.

Back 2

Inductance

Front 3

This is the fundamental unit of electricity that moves through a conductor when current is flowing.

Back 3

Electrons

Front 4

Which term describes the NEMA rating of a welding machine?

Back 4

Duty cycle

Front 5

Electrode positive means?

Back 5

Reverse polarity

Front 6

The number of _______ never increases or decreases in the atom.

Back 6

Protons

Front 7

Electrons have a _______ charge.

Back 7

Negative

Front 8

Which term measures the strength of a current of electricity?

Back 8

Amperage

Front 9

A charged atom is called?

Back 9

An ion

Front 10

What term best describes a medium that provides an electrical path for current to flow through?

Back 10

Conductor

Front 11

The electron flow theory states that electrons move from ____________.

Back 11

Negative to positive

Front 12

This term describes a material that can stop current flow through itself.

Back 12

Insulator

Front 13

The nucleus of an atom has?

Back 13

Protons and neutrons

Front 14

Which term describes the voltage output of the machine during welding?

Back 14

Arc voltage

Front 15

When current flows through a coil wrapped around an iron core, what is created?

Back 15

A magnetic field

Front 16

This device in a welding machine is designed to have a certain number or turns of wire.

Back 16

Coil

Front 17

The main function of this device is to change AC to DC.

Back 17

Rectifier

Front 18

Electrode negative is?

Back 18

Straight polarity

Front 19

The current flows in one direction only and has either a positive or negative value.

Back 19

Direct current

Front 20

Which term describes a piece of equipment used to create electricity of sufficient volume for welding?

Back 20

Generator

Front 21

Which is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source.

Back 21

Volt-amp curve

Front 22

When no current is flowing in the circuit, but the machine is turned on, you can measure the?

Back 22

Open circuit voltage

Front 23

The speed at which AC changes direction is called the?

Back 23

Frequency

Front 24

This term describes the property of an electrical conductor that opposes the flow of current.

Back 24

Resistance

Front 25

In welding, this term describes what is created when there is enough amperage and voltage to overcome the natural resistance to the flow of the electricity.

Back 25

Arc

Front 26

What phase of power supplies most industrial applications?

Back 26

Three-phase power

Front 27

This welding machine transforms AC to DC.

Back 27

Transformer rectifier

Front 28

This term describes one complete revolution of the AC alternator.

Back 28

Cycle

Front 29

What happens when mechanical energy is applied to a conductor and it moves across the magnetic lines of force in a magnetic field?

Back 29

Electrical current is generated.

Front 30

These machines convert high voltage, low amperage to low voltage, high amperage by the use of a primary and secondary coil.

Back 30

AC Transformer

Front 31

What does EMF stand for?

Back 31

Electromotive force

Front 32

Which term describes the typical sound of an AC transformer welding machine?

Back 32

Buzz box

Front 33

This type of welding machine is capable of changing DC to high frequency AC.

Back 33

Inverter

Front 34

What is the function of the secondary winding on a transformer welder?

Back 34

To step down the voltage

Front 35

One advantage of an AC transformer welder is freedom from?

Back 35

Arc blow

Front 36

What is the purpose of a silicone-controlled rectifier?

Back 36

To change AC to DC

Front 37

What is one advantage of an AC-DC transformer-rectifier welding machine?

Back 37

You have a choice of polarity

Front 38

A DC motor generator produces what type of welding current?

Back 38

DC

Front 39

How can you change the polarity on an AC alternator welding machine?

Back 39

An AC alternator has no fixed polarity

Front 40

What is one advantage of an engine-driven generator welding machine?

Back 40

Portability

Front 41

What is one advantage of all transformer welding machines?

Back 41

The maintenance costs are lower

Front 42

These welding power sources immediately rectify the incoming AC to DC and then transistors create a higher frequency AC. The higher frequency AC is then rectified to extremely smooth DC.

Back 42

Inverters

Front 43

How did manufacturers reduce the size and weight of transformers and generate significant energy savings over conventional power sources?

Back 43

Inverter technologe

Front 44

What is an advantage of an inverter welding machine?

Back 44

Small and lightweight

Front 45

What is a disadvantage of an inverter welding machine?

Back 45

Higher initial cost that transformers or rectifiers.