Electrical Theory And Circuits

Question 1

What is significant about materials which have 5 valence electrons

Answer 1

These materials are good insulators

Question 2

What is the significance of materials with 4 valence electrons

Answer 2

These materials are classified as semiconductors

Question 3

Which of the following best describes the positively charged particles which are found in the nucleus

Answer 3

Protons

Question 4

What best describes the flow of electrons in a conductor

Answer 4

Current

Question 5

How is the resistance of a affected by its cross-sectional area

Answer 5

The resistance decreases as the cross-sectional area increases

Question 6

What is the term used to describe the increase of the resistance of a conductor as the temperature of the resistor increases?

Answer 6

Positive coefficient of resistance

Question 7

Atoms which gain an electron will have a negative charge. T or F

Answer 7

True

Question 8

What is another name for electromotive force?

Answer 8

Voltage

Question 9

What is the result of two different types of atoms joining together

Answer 9

Compound

Question 10

Which of the folling statements is true:
Total resistance in a series circuit is always less that the smallest resistor.

The current is the same at every point in a series circuit.

Answer 10

The current is the same at every point in a series circuit.

Question 11

Which of the following statements is true:
A circuit breaker is a circuit protection devise which can be reset or re-used.

A fuse is a overcurrent protection device which can be reset or re-used.

Answer 11

A circuit breaker is a circuit protection device which can be reset or re-used.

Question 12

What is the name of the relationship between voltage, current and resistance?

Answer 12

Ohm’s Law

Question 13

What is the name of the sum of the current flowing away from any point in an electrical circuit is equal to the sum of the current flowing into that point in the circuit?

Answer 13

Kirchoff’s Current Law

Question 14

What are the units of electrical power?

Answer 14

Watts

Question 15

What is an element?

Answer 15

A material made up of only one kind of atom.

Question 16

What is an atom?

Answer 16

The smallest particle of an element

Question 17

What is a compound ?

Answer 17

A combination of two or more elements

Question 18

Name the parts of an atom

Answer 18

Neutrons, protons and electrons

Question 19

What is a valence electron?

Answer 19

An electron in the outermost orbit of an atom

Question 20

What is an ion

Answer 20

A charged atom

Question 21

What is Coloumb’s law

Answer 21

Opposite charges attract and like charges repel one another

Question 22

Describe the properties of a conductor

Answer 22

A material with one, two, or three valence electrons

Question 23

Describe the properties of an insulator

Answer 23

A material with 5 or more valence electrons

Question 24

Describe the properties of a semiconductor

Answer 24

A material with four valence electrons

Question 25

What is EMF

Answer 25

EMF is electromotive force, the force that causes electrons to flow

Question 26

List the sources of EMF

Answer 26

Electrostatic, electromagnetic, chemical, photoelectric

Question 27

Define current

Answer 27

The amount of electrons flowing in an electric circuit

Question 28

What does conventional theory state

Answer 28

Current flows positive to negative

Question 29

What does electron theory state

Answer 29

Current flows negative to positive

Question 30

What is resistance measured in

Answer 30

OHMS, it is the opposition to flow of electrons

Question 31

Which wire size is larger? 4/0 or no. 40

Answer 31

4/0

Question 32

What type of solder is to be used for electrical repairs

Answer 32

Rosin core solder

Question 33

Battery negative plates and positive plate with separators between them are called a: a. Battery b. Cell c. Element d. Plate group

Answer 33

C. Element

Question 34

A maintenance free battery:

Answer 34

Can be visually inspected and load tested for reuse

Question 35

Parallel connections within the battery result in:

Answer 35

Same voltage with increased current production

Question 36

The electrolyte in a lead acid battery is made up of water and:

Answer 36

Sulphuric acid

Question 37

Each fully charged battery cell produces approximately

Answer 37

2.1 volts

Question 38

When a battery is discharged:

Answer 38

All plates have changed to lead sulphate (PbSO4)

Question 39

An open circuit voltage test is performed on a battery to determine:

Answer 39

The state of charge of a battery

Question 40

If a battery load test is performed on a 12 volt battery at room temperature, the final voltage should be

Answer 40

Greater than 9.6 volts

Question 41

When servicing a battery with tapered terminals, three necessary tools are:

Answer 41

Battery pliers, a terminal puller, and a terminal spreader

Question 42

A fully charged battery is best stored:

Answer 42

In a cool or cold location

Question 43

Prior to charging a battery, it is important that:

Answer 43

The plates are submerged in electrolyte

Question 44

The total carrying capacity of multiple series battery groups:

Answer 44

Remains the same with the addition of every battery

Question 45

If an open occurs in a circuit, current:

Answer 45

Decreases

Question 46

As applied voltage increases:

Answer 46

Current increases

Question 47

Voltage is:

Answer 47

Potential difference

Question 48

Resistance is:

Answer 48

Determined by circuit construction

Question 49

As resistance in a current increases, currrent:

Answer 49

Decreases

Question 50

Most insulators are:

Answer 50

Compounds of two or more elements

Question 51

Resistance of a conductor is determined by:

Answer 51

Length, cross sectional area, temperature, and type of material

Question 52

Which form of voltage sources require polarity markings?

Answer 52

Direct voltage