Electrical

Question 1

What is the force exerted by protons and electrons?

Answer 1

Electric charge

Question 2

What is the charge for Protons Electrons Neutrons

Answer 2

Positive Negative No charge

Question 3

What are the four distinct states of matter?

Answer 3

Solid, liquid, gas, plasma

Question 4

If an object has more protons than electrons, what is its electrical charge?

Answer 4

It is positively charged.

Question 5

What are free electrons?

Answer 5

They are electrons that loosely bonded around the nucleus, and can be easily knocked loose

Question 6

What is a molecule?

Answer 6

The smallest part that matter can be divided into, without changing its makeup.

Question 7

Describe static electricity

Answer 7

When the positive and negative charges are balanced and the charge does not move

Question 8

Describe unbalanced electrical charges

Answer 8

Unbalanced electrical charges is also known as electrical flow, or current flow. The greater the unbalance, the greater the voltage

Question 9

What is magnetism?

Answer 9

It is the physical phenomenon caused by electron movement.

Question 10

Describe a permanent magnet

Answer 10

The magnetic property is caused by the spinning of electrons in the atoms that make up the material the magnet is formed out of.

Question 11

Describe an electromagnet

Answer 11

Caused by electrons moving through a coil of wire wound around a core material

Question 12

How are magnetic fields pictured?

Answer 12

They are pictured as magnetic flux lines.

Question 13

What are some common materials for permanent magnets?

Answer 13

Steel alloys, cobalt, nickel, alnico, platinum and cobalt alloys, samarium and cobalt alloys

Question 14

What does a compass do near a wire carrying an electric charge?

Answer 14

It causes the needle to deflect at a right angle to the wire.

Question 15

What are the basic principles of electromagnetism?

Answer 15

-moving electrically charged particles creates magnetic fields -magnetic fields attract or repel moving charged particles -moving magnetic fields near charged particles causes current flow

Question 16

What does passing a magnetic field through a conductor generate?

Answer 16

Induced electromotive force(voltage). The current that is caused to flow is called induced current.

Question 17

What is permeability in regards to electromagnets?

Answer 17

The ease in which a material can be magnetized by a solenoid.

Question 18

What is a good conductor?

Answer 18

A material that exhibits low resistance to current flow

Question 19

Give some examples of good conductors

Answer 19

Silver-best Copper-second Gold-third, but only one that resists oxidation

Question 20

What makes a good insulator?

Answer 20

A material that is a poor conductor of electricity. Some examples are glass, mica, dry wood, plastics

Question 21

What is a semiconductor?

Answer 21

A material that is neither a good conductor nor a good insulator.

Question 22

Describe direct current (DC)

Answer 22

The flow of free electrons in the conductors is always in the same direction, and has fixed polarity.

Question 23

What is ohms law formula?

Answer 23

E=IxR

Question 24

What is E in formula?

Answer 24

E=power=volts=potential difference

Question 25

What is I in formula?

Answer 25

I=current flow=amps

Question 26

What is R in formula?

Answer 26

R=resistance=ohms

Question 27

Changing AC to DC voltage is done with what

Answer 27

Rectifier

Question 28

What is our RMS, and what is the value of it?

Answer 28

Root mean square, and its value is .707

Question 29

What is the pattern of a single phase in one cycle?

Answer 29

Sine wave

Question 30

How is voltage induced?

Answer 30

It is done when a conductor cuts magnetic lines of flux. The maximum induced voltage occurs when the conductor is traveling at right angles through the lines of flux

Question 31

What is frequency?

Answer 31

Frequency is the number of cycles and alternating current generates for second also known as hertz

Question 32

What is the sine wave form for a three-phase motors?

Answer 32

The phases are out of phase by 120°

Question 33

How was DC voltage changed to AC?

Answer 33

Through an inverter

Question 34

How does an electric current flow?

Answer 34

There must be a potential difference between two points of the supplying device the potential difference is called voltage measured in volts

Question 35

What are amps?

Answer 35

Amps are the rate of flow of electrons in an electrical circuit

Question 36

How many watts in 1 hp?

Answer 36

746 Watts

Question 37

Describe an open circuit

Answer 37

It is a circuit that has an incomplete pass for current flow because a switch is open

Question 38

Materials fall into one of three categories based on the resistance to current flow of that material. What are the three categories

Answer 38

Conductors, insulators, semi conductors

Question 39

Describe electromotive force

Answer 39

The voltage generated by moving a conductor through a magnetic field

Question 40

Describe resistance

Answer 40

The property of the materials that opposes the flow of an electric current

Question 41

List three factors that determine the amount of voltage induced in a coil

Answer 41

Material of the coils core, frequency, amp turns

Question 42

List four factors that affect the resistance of a conductor

Answer 42

-material -cross-sectional area -length of conductor -temperature

Question 43

What does alternating current mean?

Answer 43

When the current changes polarity continuously and regularly

Question 44

If an atom has more protons and electrons it is said to have what kind of a charge?

Answer 44

A positive charge

Question 45

A metal that can be easily magnetized by solenoid is said to have what?

Answer 45

High permeability

Question 46

When a conductor is passed through a magnetic field what is created?

Answer 46

Induced current

Question 47

A material whose Atoms have free electrons in its outer valence is said to be what?

Answer 47

A good conductor

Question 48

Current that flows from a positive to negative is called what

Answer 48

Conventional flow

Question 49

In the series circuit what stays constant throughout?

Answer 49

The current or amps

Question 50

What color is the grounded circuit conductor, or neutral wire in residential wiring

Answer 50

White

Question 51

What is the wiring color combination for industrial three phase?

Answer 51

Black, red, blue

Question 52

What is the amp a measure of?

Answer 52

Electron flow

Question 53

What does a fuse protect the circuit from?

Answer 53

Over current

Question 54

Voltage in a parallel circuit is?

Answer 54

Equal through each branch of the circuit

Question 55

Is voltage measured in series or parallel with the load?

Answer 55

In parallel with the load

Question 56

Time delay fuses have what?

Answer 56

Dual elements