Electical Theory

Question 1

Which of the following is the correct unit of measurement for current?

Answer 1

Amp

Question 2

Opposition to current flow best describes which of the following terms?

Answer 2

Resistance

Question 3

Nucleus of the atom contains what type of charge?

Answer 3

Positive

Question 4

Uniform movement of electrons in a specific direction is know as what?

Answer 4

Current flow

Question 5

How many electrons in a valence rings is called a good conductor?

Answer 5

2

Question 6

Which of the following has no effect on current?

Answer 6

Magnetism WRONG

Air pressure RIGHT

Heat WRONG

Fluctuate WRING

Question 7

Which of the following statements is true?

Answer 7

A. Current is inversely proportional to resistance. (Correct)

B. Current is inversely proportional to voltage

C. Smaller the conductor, the least resistance to current flow.

D. As temperature of conductor rises, resistance decreases.

Question 8

How does a battery produce direct current?

Answer 8

Chemical energy to electrical energy!

Question 9

What is another name for secondary cell batteries?

Answer 9

Accumulators

Question 10

Conductor must be moved in what direction to produce electricity in a dc generator?

Answer 10

Perpendicular

Question 11

(True or false) DC is a constant output that does not vary with respect to time?

Answer 11

True

Question 12

What type of test is utilized to measure AC current in a sine wave format?

Answer 12

Oscilloscope

Question 13

What term is utilized when the amount of voltage reaches the maximum positive position on sine wave?

Answer 13

Peak value

Question 14

Effective value is also know as?

Answer 14

RMS

Question 15

How long does it take to complete one continuous sine wave?

Answer 15

0.25 seconds

Question 16

Which of the following principals does an AC generator used to generate current?

Answer 16

Electromagnetic

Question 17

When a conductor is formed into a cool it becomes which of the following electrical items?

Answer 17

Inductor (Correct)

Capacitor

Diode

Transistor

Question 18

What is the symbol of inductance?

Answer 18

L

Question 19

How many stages does a capacitor perform?

Answer 19

4 stages

Question 20

What unit of measurement is used for capacitance?

Answer 20

Farad

Question 21

What is defined as the total opposition to flow in a AC circuit?

Answer 21

Impedance

Question 22

True or false. Apparent power is the voltage times the current in any circuit?

Answer 22

True

Question 23

Which type of electrical equipment used for over current protection?

Answer 23

Circuit breaker

Question 24

What type of charged particles are associated with electrons?

Answer 24

Neagtive

Question 25

Which of the following is NOT part of a standard battery?

Answer 25

Positive electrode Gap suppressor (correct) Negative electrode Electrolyte

Question 26

This electrical term is described as the pushing force behind electricity.

Answer 26

Voltage

Question 27

Voltage may also be referred to as ?

Answer 27

Difference of potential Electromotive force (EMF) Electrical pressure

Question 28

What letter represents voltage in a formula?

Answer 28

E

Question 29

How is voltage calculated in a formula?

Answer 29

By multiplying current and resistance. E = I x R

Question 30

What is unit of measurement for voltage?

Answer 30

Volt

Question 31

This electrical term is described as the actual movement of electrons through the conductor.

Answer 31

Current

Question 32

What is unit of measurement for current?

Answer 32

AMP

Question 33

What letter is used for current in a formula?

Answer 33

I

Question 34

How is current calculated?

Answer 34

Current is calculated by dividing voltage by resistance. I = E x R

Question 35

This electrical term is described as the opposition to current flow.

Answer 35

Resistance

Question 36

Materials with little resistance are knows as?

Answer 36

Conductors

Question 37

Materials with high resistance is know as?

Answer 37

Insulators

Question 38

What is the unit of measurement for ohms?

Answer 38

The OHMs symbol

Question 39

What letter represents resistance in a formula?

Answer 39

R

Question 40

How is resistance calculated?

Answer 40

R = E / I

Question 41

Calculation of voltage per ohms law is accomplished by using what formula?

Answer 41

E = I x R

Question 42

This electrical term is described as the rate at which work is done, or the usable electricity produced or consumed.

Answer 42

Power.

Question 43

What is the unit of measurement for power?

Answer 43

Watt

Question 44

How is wattage calculated?

Answer 44

By multiplying volts and amperes; Thai formula is also know as the power law. Formula P= E x I

Question 45

Describe direct current.

Answer 45

Current flowing in only one direction, the current flows from negative to positive.

Question 46

Describe alternating current.

Answer 46

It's is called AC because it changed directions. An AC cycle is made up of one positive and one negative alternation. AC flows one way for the cycle then the other way for half the cycle.

Question 47

What are know as the smallest building blocks of matter?

Answer 47

Atoms

Question 48

How much weight does the nucleus account for the atom?

Answer 48

99.9%

Question 49

What are protons?

Answer 49

Protons are positively charged Atomic number of the atom is equal to the number of protons Atoms have the same number of protons and electrons; making atoms electrically neutral

Question 50

What is a Neuton?

Answer 50

Neuton has no charge, which makes is neutrals

Question 51

What are electrons?

Answer 51

Electrons are negatively charged particles. Electrons are arranged in energy levels called shells or rings.

Question 52

When atoms share atoms what is that known as?

Answer 52

Covalent bonding.

Question 53

Electrically charged atoms are called?

Answer 53

Ions

Question 54

What is the valence ring and what does it determine?

Answer 54

The outermost ring and it determines is the atom is going to be a insulator it conductor.

Question 55

Valence ring with 2 electrons is going to be what?

Answer 55

Conductor. Cause it allows other electors to pass through easily.

Question 56

Valence ring with 7 to 8 electrons is going to be a what?

Answer 56

Insulator

Question 57

Valence ring with 4 to 5 electrons is going to be known as a what?

Answer 57

Semi conductor.

Question 58

Current flow has how many effects and what are they?

Answer 58

4 Magnetism, heat, chemical action, and physical shock

Question 59

Under certain circumstances, as little as ______ amperes could stop your heart.

Answer 59

0.1 amperes

Question 60

If voltage is increased what will happen to current?

Answer 60

It will increase to.

Question 61

If resistance is increased what will happen to the voltage?

Answer 61

It will decrease and so will the current.

Question 62

Most common source of DC?

Answer 62

Batteries

Question 63

In order to create electricity with a generator you will need?

Answer 63

A conductor, magnetic field, and a relative motion.

Question 64

This value is simply the value of the sine wave at any given point in time

Answer 64

Instantaneous

Question 65

This value in a AC is the average of all the instantaneous values during one alternation.

Answer 65

Average value

Question 66

What does RMS stand for?

Answer 66

Root mean square

Question 67

What is the unit of measurement for frequency?

Answer 67

Hertz

Question 68

How does a generator work?

Answer 68

It converts mechanical energy to electrical energy

Question 69

What is the rotating section of the the generator called?

Answer 69

Rotor

Question 70

What is the stationary section of a generator called?

Answer 70

Stator

Question 71

What does a single phase generator consist of?

Answer 71

Consist of one conductor and one magnetic field

Question 72

What are the four stages of a capacitor?

Answer 72

Charging, charged, discharging, and discharged.

Question 73

What units is capacitance measured in?

Answer 73

Farads

Question 74

What circuit is defined as two or more units of resistance connected end to end to form only one path for current flow and an AC or DC voltage source?

Answer 74

Series circuit

Question 75

What circuit is defined as having more than one current path connected to a common voltage source?

Answer 75

Parallel circuit

Question 76

A parallel circuit must contain at least how many paths for current flow?

Answer 76

2