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CE Exam MARCH CYCLE > Electical Theory > Flashcards

Electical Theory Flashcards

1
Q

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

A

Amp

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2
Q

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

A

Resistance

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3
Q

Nucleus of the atom contains what type of charge?

A

Positive

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4
Q

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

A

Current flow

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5
Q

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

A

2

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6
Q

Which of the following has no effect on current?

A

Magnetism WRONG

Air pressure RIGHT

Heat WRONG

Fluctuate WRING

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7
Q

Which of the following statements is true?

A

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.

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8
Q

How does a battery produce direct current?

A

Chemical energy to electrical energy!

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9
Q

What is another name for secondary cell batteries?

A

Accumulators

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10
Q

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

A

Perpendicular

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11
Q

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

A

True

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12
Q

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

A

Oscilloscope

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13
Q

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

A

Peak value

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14
Q

Effective value is also know as?

A

RMS

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15
Q

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

A

0.25 seconds

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16
Q

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

A

Electromagnetic

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17
Q

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

A

Inductor (Correct)

Capacitor

Diode

Transistor

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18
Q

What is the symbol of inductance?

A

L

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19
Q

How many stages does a capacitor perform?

A

4 stages

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20
Q

What unit of measurement is used for capacitance?

A

Farad

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21
Q

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

A

Impedance

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22
Q

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

A

True

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23
Q

Which type of electrical equipment used for over current protection?

A

Circuit breaker

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24
Q

What type of charged particles are associated with electrons?

A

Neagtive

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25
Q

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

A

Positive electrode

Gap suppressor (correct)

Negative electrode

Electrolyte

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26
Q

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

A

Voltage

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27
Q

Voltage may also be referred to as ?

A

Difference of potential

Electromotive force (EMF)

Electrical pressure

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28
Q

What letter represents voltage in a formula?

A

E

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29
Q

How is voltage calculated in a formula?

A

By multiplying current and resistance.

E = I x R

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30
Q

What is unit of measurement for voltage?

A

Volt

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31
Q

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

A

Current

32
Q

What is unit of measurement for current?

A

AMP

33
Q

What letter is used for current in a formula?

A

I

34
Q

How is current calculated?

A

Current is calculated by dividing voltage by resistance.

I = E x R

35
Q

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

A

Resistance

36
Q

Materials with little resistance are knows as?

A

Conductors

37
Q

Materials with high resistance is know as?

A

Insulators

38
Q

What is the unit of measurement for ohms?

A

The OHMs symbol

39
Q

What letter represents resistance in a formula?

A

R

40
Q

How is resistance calculated?

A

R = E / I

41
Q

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

A

E = I x R

42
Q

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

A

Power.

43
Q

What is the unit of measurement for power?

A

Watt

44
Q

How is wattage calculated?

A

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

45
Q

Describe direct current.

A

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

46
Q

Describe alternating current.

A

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.

47
Q

What are know as the smallest building blocks of matter?

A

Atoms

48
Q

How much weight does the nucleus account for the atom?

A

99.9%

49
Q

What are protons?

A

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

50
Q

What is a Neuton?

A

Neuton has no charge, which makes is neutrals

51
Q

What are electrons?

A

Electrons are negatively charged particles.

Electrons are arranged in energy levels called shells or rings.

52
Q

When atoms share atoms what is that known as?

A

Covalent bonding.

53
Q

Electrically charged atoms are called?

A

Ions

54
Q

What is the valence ring and what does it determine?

A

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

55
Q

Valence ring with 2 electrons is going to be what?

A

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

56
Q

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

A

Insulator

57
Q

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

A

Semi conductor.

58
Q

Current flow has how many effects and what are they?

A

4

Magnetism, heat, chemical action, and physical shock

59
Q

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

A

0.1 amperes

60
Q

If voltage is increased what will happen to current?

A

It will increase to.

61
Q

If resistance is increased what will happen to the voltage?

A

It will decrease and so will the current.

62
Q

Most common source of DC?

A

Batteries

63
Q

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

A

A conductor, magnetic field, and a relative motion.

64
Q

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

A

Instantaneous

65
Q

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

A

Average value

66
Q

What does RMS stand for?

A

Root mean square

67
Q

What is the unit of measurement for frequency?

A

Hertz

68
Q

How does a generator work?

A

It converts mechanical energy to electrical energy

69
Q

What is the rotating section of the the generator called?

A

Rotor

70
Q

What is the stationary section of a generator called?

A

Stator

71
Q

What does a single phase generator consist of?

A

Consist of one conductor and one magnetic field

72
Q

What are the four stages of a capacitor?

A

Charging, charged, discharging, and discharged.

73
Q

What units is capacitance measured in?

A

Farads

74
Q

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?

A

Series circuit

75
Q

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

A

Parallel circuit

76
Q

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

A

2

CE Exam MARCH CYCLE (5 decks)

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