# Electricity Flashcards

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1
Q
```This term describes a noisy, uncontrollable arc that flares from side to side
A)Arc voltage
B)Arc blow
C)Inductance
D) Resistance```
A

B)Arc blow

2
Q
```This term describes the influence exerted by a magnetic field on neighbouring bodies without physical contact
A)Voltage
B)Amperage
C)Frequency
D) Inductance```
A

D) Inductance

3
Q
```This is the Fundamental unit of electricity that moves through a conductor when current is flowing
A)Resistors
B)Electrons
C)Conductors
D) Rectifiers```
A

B)Electrons

4
Q
```What term describes the NEMA rating of a welding machine
A)Duty cycle
B)Direct current
C)Arc voltage
D) Amperage```
A

A)Duty cycle

5
Q
```Electrode positive means
A)Straight polarity
B)Reverse polarity
C)AC transformer
D) Alternating current```
A

B)Reverse polarity

6
Q
```Electrons have a… Charge
A)Neutral
B)12 V
C)Positive
D) Negative```
A

D) Negative

7
Q
```Which term measures the strength of a current of electricity
A)Amperage
B)Voltage
C)Electron
D) Inductance```
A

A)Amperage

8
Q
```What term describes a medium that provides an electrical parts for current to flow through
A)Cycle
B)Circuit
C)Conductor
D) Core```
A

C)Conductor

9
Q

The electron flow theory states that electrons move from
A) Positive to negative
B)Negative to positive

A

B)Negative to positive

10
Q
```This term describes a material that can stop current flow through its self
A)Inductor
B)Inverter
C)Conductor
D) Insulator```
A

D) Insulator

11
Q
```Which term describes the voltage output of the machine during welding
A)Arc rectification
B)Arc blow
C)Arc voltage
D) Inductance```
A

C)Arc voltage

12
Q
```When current flows through a coil wrapped around an iron core what is created?
A)A magnetic field
B)Reverse polarity
C)Transformer rectifier
D) Duty cycle```
A

A)A magnetic field

13
Q
```This device in a welding machine is designed to have a certain number of turns of wire
A)Circuit
B)Core
C)Coil
D) Cycle```
A

C)Coil

14
Q
```The main function of this device is to change AC to DC
A)Resistor
B)Rectifier
C)Relay
D) Reactor```
A

B)Rectifier

15
Q
```Electrode negative is:
A)Straight polarity
B)Reverse polarity
C)AC transformer
D) Alternating current```
A

A)Straight polarity

16
Q
```This current flows in one direction only and has either a positive or negative value.
A)Direct current
B)Alternating current
C)Open circuit voltage
D) Arc voltage```
A

A)Direct current

17
Q
```What term describes a piece of equipment used to create electricity of sufficient volume for welding?
A)Inductor
B) Resistor
C)Transformer
D) Generator```
A

D) Generator

18
Q
```Which is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source?
A)Open circuit voltage
B)Volt-amp curve
C)Electromotive force
D) Duty cycle```
A

B)Volt-amp curve

19
Q
```When no current is flowing in the circuit but the machine is turned on you can measure the:
A)Open circuit voltage
B)Constant current
C)Alternating current
D) Volt-amp curve```
A

A)Open circuit voltage

20
Q
```The speed at which a C changes direction is called the:
A)Voltage
B)Amperage
C)Frequency
D) Resistance```
A

C)Frequency

21
Q
```This term describes the property of an electrical conductor that opposes the flow of current
A)Resistance
B)Inductance
C)Voltage
D) Amperage```
A

A)Resistance

22
Q
```In welding, this term describes what is created when there is enough amperage and voltage overcoming the natural resistance to the flow of the electricity.
A)Amp
B)Volt
C)Cycle
D) Arc```
A

D) Arc

23
Q
```What phase of power supplies most industrial applications
A)Single phase power
B)To phase power
C)Three phase power
D) For phase power```
A

C)Three phase power

24
Q
```This welding machine transforms AC to DC.
A)Line transformer
B)Transformer rectifier
C)DC generator
D) AC transformer```
A

D) AC transformer

25
Q
```This term describes one complete revolution of the AC alternator
A)Circuit
B)Core
C)Coil
D) cycle```
A

D) cycle

26
Q
```What happens when mechanical energy is applied to a conductor and moves across the magnetic lines of force in a magnetic field
A)Magnetism is generated
B)Electrical current is generated
C)Single phase power is generated
D) Three phase power is generated```
A

B)Electrical current is generated

27
Q
```What is an advantage of an inverter welding machine
A)Small and light weight
B)Generally cheaper to buy
C)Portability
D) Function well in a dirty environment```
A

A)Small and light weight

28
Q

What is a disadvantage of an inverter welding machine?
A)Poor arc starting characteristics
B)Higher input power requirements
C)Hire initial cost than transformers or rectifiers
D) Cannot be configured for automation

A

C)Hire initial cost than transformers or rectifiers