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Module 3: Electrical Fundamentals (B1) :!: > 3.3: Electrical Terminology > Flashcards

3.3: Electrical Terminology Flashcards

1
Q
  1. Potential difference (PD) is:
    (a) The difference in pressure between two point in a circuit.
    (b) The difference in pressure that might exist in a circuit.
    (c) The difference between a positive and negative point in a circuit only.
A

(a) The difference in pressure between two point in a circuit.

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2
Q
  1. PD is measured in;
    (a) Amps
    (b) Volts.
    (c) Mohs.
A

(b) Volts.

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3
Q
  1. The symbol for voltage is:
    (a) E
    (b) V
    (c) I
A

(b) V

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4
Q
  1. An electrical current is defined as
    (a) The rate of flow of electrons in a circuit.
    (b) A quantity of electrons in a circuit,
    (c) Pressure that cause electrons to flow.
A

(a) The rate of flow of electrons in a circuit.

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5
Q
  1. The symbol for current is:
    (a) I
    (b) C
    (c) A
A

(a) I

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6
Q
A

(c) Current will flow from point B to point A

Note: Conventional current flow is systems that are designed assuming flow is from positive to negative

While Electron flow is what actually happens which is flow from negative to positive

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7
Q
  1. Current is;
    (a) The rate of flow of electrons in a circuit.
    (b) A quantity of electrons, that operates in a circuit.
    (c) The pressure that causes electrons to flow.
A

(a) The rate of flow of electrons in a circuit.

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8
Q
  1. Three effects of current in a circuit is;
    (a) Heat, light and magnetism.
    (b) Chemical, heat and magnetism.
    (c) Magnetism, heat and friction.
A

(a) Heat, light and magnetism.

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9
Q
  1. A Coulomb is a
    (a) Quantity of electrons.
    (b) The rate of flow of electrons.
    (c) The opposition to the flow of electrons.
A

(a) Quantity of electrons.

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10
Q
  1. The symbol for a Coulomb is;
    (a) C
    (b) B
    (c) Q
A

(a) C

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11
Q
  1. What is 3.25 volts in millivolts
    (a) 3.25 millivolts
    (b) 3,250 millivolts
    (c) 325,000 millivolts
A

(b) 3,250 millivolts

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12
Q
  1. Electromotive force is measured in
    (a) Watts
    (b) Ohms
    (c) Volts
A

(c) Volts

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13
Q
  1. 20 amperes flow for 20 seconds. How many coulombs has flowed?
    (a) 400
    (b) 20
    (c) 1
A

(a) 400

Note: Q = I * T where Q is charge in Coulombs, I is current in Amps and T is time in seconds

Q = (20A) * (20s), Q = 400 C

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14
Q
  1. A volt can be considered to be a
    (a) unit of electrical pressure
    (b) quantity of electrical energy
    (c) unit of electrical power
A

(a) unit of electrical pressure

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15
Q
  1. If 2 coulombs flowed through a circuit in 2 seconds, the circuit would have
    (a) 2 volts PD
    (b) 2 amps
    (c) 1 amp
A

(c) 1 amp

Note: 1 Amp = 1 Coulomb/sec

Q = I * T where Q is charge in Coulombs, I is current in Amps and T is time in seconds

(2C) = I * (2s)

I = 2/2, I = 1A

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16
Q
  1. A coulomb is
    (a) one ampere per second
    (b) one ampere x second
    (c) one second per ampere
A

(a) one ampere per second

Note: 1 Ampere is also one Coulomb per second aswell

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17
Q
  1. The potential difference between two conductors which are insulated from each other is measured in:
    (a) Ohms
    (b) Volts
    (c) Amperes
A

(b) Volts

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18
Q
  1. An aircraft battery has a capacity of 10 AH. How many Coulombs are stored in the battery?
    (a) 36.000 Coulomb
    (b) 6,000 Coulomb
    (c) 360 Coulomb
A

(a) 36.000 Coulomb

Remember: 1 amp = 1 Coulomb / second

and also 1 Coulomb = 1 amp / second

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19
Q
  1. The SI unit of work is
    (a) Joules per second (Watts)
    (b) Kilogram metres – force
    (c) Joules per metre

DODGY QUESTION <>

A

(c) Force x metre

Remember: Work is force times a distance

Power is Work (

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20
Q
  1. Power is the rate of doing work. It is measured in
    (a) joules/second
    (b) watts/second
    (c) joules x seconds
A

(a) joules/second

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21
Q
  1. The Watt can be expressed as
    (a) Joules per second
    (b) Joules x seconds
    (c) Seconds per Joul
A

(a) Joules per second

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22
Q
  1. .002KV equals
    (a) 20 volts.
    (b) 2.0 volts.
    (c) 0 .2 volt.
A

(b) 2.0 volts.

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23
Q
  1. When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
    (a) The circuit breaker.
    (b) The ground reference.
    (c) The switch.
A

(b) The ground reference.

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24
Q
  1. In a circuit, conventional current flow states that;
    (a) Electrons flow from positive to negative side of a circuit.
    (b) Electrons flow from negative to positive side of a circuit,
    (c) Electrons flow in one direction in the circuit.
A

(a) Electrons flow from positive to negative side of a circuit.

Note:

Conventional flow - positive to negative

Electron flow - actually what happens in real life - electrons flow from negative to positive

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25
Q
  1. In a circuit, electron flow states that;
    (a) Electrons flow from positive to negative side of a circuit.
    (b) Electrons flow from negative to positive side of a circuit,
    (c) Electrons flow in one direction in the circuit.
A

(b) Electrons flow from negative to positive side of a circuit,

Note:

Electron flow - negative to positive

Conventional flow - positive to negative

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26
Q
  1. Resistance is defined as;
    (a) Ease which current flow through a circuit.
    (b) Opposition to current flow through a circuit,
    (c) The speed at which electrons flow in a circuit.
A

(b) Opposition to current flow through a circuit,

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27
Q
  1. Resistance is measured in,
    (a) Ohms
    (b) Mohs
    (c) Coulombs
A

(a) Ohms

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28
Q
  1. Which of the following materials has the highest conductivity for the same crossectional area and length
    (a) Copper
    (b) Aluminium
    (c) Glass
A

(a) Copper

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29
Q
  1. Which of the following materials has the highest conductivity for the same crossectional area and length
    (a) Aluminium
    (b) Gold
    (c) Silver
A

(c) Silver

Remeber So Cah GA

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30
Q
  1. Calculate the Conductance of a substance with 20 ohms Resistance
    (a) 0.005 mho
    (b) 0.05 mho
    (c) 0.5 mho
A

(b) 0.05 mho

Conductance (mho /siemens) = (upside down resistance symbol/ s) = 1 / R

where R is resistance

Conductance symbol on diagram is G

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31
Q
  1. Resistance of a conductor will increase with which of the following changes to the cross-sectional area and length of the conductor?
    (a) Cross-sectional area is increased, length is increased
    (b) Cross-sectional area is increased, length is decreased
    (c) Cross-sectional area is decreased, length is increased
    (d) Cross-sectional area is decreased, length is decreased
A

(c) Cross-sectional area is decreased, length is increased

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32
Q
  1. A material whose resistance decreases as the temperature increases has what temperature coefficient?
    (a) Positive
    (b) Negative
    (c) Zero
    (d) Neutral
A

(b) Negative

'’Temperature coefficient of resistance symbolises the resistance change factor per degree of temperature change

For pure metals, this coefficient is a positive number, meaning that resistance increases with increasing temperature. For the elements carbon, silicon, and germanium, this coefficient is a negative number, meaning that resistance decreases with increasing temperature.

For some metal alloys, the temperature coefficient of resistance is very close to zero, meaning that the resistance hardly changes at all with variations in temperature ( a good property if you want to build a precision resistor out of metal wire).

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33
Q
  1. A semiconductor has what type of temperature coefficient of resistance:
    (a) Positive
    (b) Negative
    (c) Zero
A

(b) Negative

'’Temperature coefficient of resistance symbolises the resistance change factor per degree of temperature change

For pure metals, this coefficient is a positive number, meaning that resistance increases with increasing temperature. For the elements carbon, silicon, and germanium, this coefficient is a negative number, meaning that resistance decreases with increasing temperature.

For some metal alloys, the temperature coefficient of resistance is very close to zero, meaning that the resistance hardly changes at all with variations in temperature ( a good property if you want to build a precision resistor out of metal wire).

Examples of semi-conductors are Silicon Germanium, aluminium

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34
Q
  1. What unit is used to express electrical power?
    (a) Volt.
    (b) Watt.
    (c) Ampere.
A

(b) Watt.

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35
Q
  1. How is the ability of a resistor to dissipate heat indicated?
    (a) By the wattage rating
    (b) By the voltage rating
    (c) By the resistance rating
    (d) By the tolerance
A

(a) By the wattage rating

'’The ability of the resistor to dissipate heat depends upon the design of the resistor itself. This ability to dissipate heat depends on the amount of surface area which is exposed to the air. A resistor designed to dissipate a large amount of heat must therefore have a large physical size. The heat dissipating capability of a resistor is measured in Watts.’’

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36
Q
  1. The factors affecting resistance of a conductor are;
    (a) Length, materials, size of electrons and size of protons.
    (b) Length, temperature, crystal structure and weight,
    (c) Material, length, cross section Area and Temperature.
A

(c) Material, length, cross section Area and Temperature.

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37
Q
  1. Copper is a ;
    (a) Better conductor than Aluminium.
    (b) Poorer conductor than Aluminium,
    (c) Is equal to Aluminium as a conductor.
A

(a) Better conductor than Aluminium.

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38
Q
  1. If a material has a positive temperature coefficient of resistance, it means that:
    (a) As the temperature rises the resistance decreases.
    (b) As the temperature falls the resistance stay the same
    (c) As the temperature rises the resistance increases.
A

(c) As the temperature rises the resistance increases.

'’Temperature coefficient of resistance symbolises the resistance change factor per degree of temperature change

For pure metals, this coefficient is a positive number, meaning that resistance increases with increasing temperature. For the elements carbon, silicon, and germanium, this coefficient is a negative number, meaning that resistance decreases with increasing temperature.

For some metal alloys, the temperature coefficient of resistance is very close to zero, meaning that the resistance hardly changes at all with variations in temperature ( a good property if you want to build a precision resistor out of metal wire).

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39
Q
  1. Copper has a:
    (a) Positive temperature coefficient.
    (b) Negative temperature coefficient.
    (c) Neutral temperature coefficient.
A

(a) Positive temperature coefficient.

'’Temperature coefficient of resistance symbolises the resistance change factor per degree of temperature change

For pure metals, this coefficient is a positive number, meaning that resistance increases with increasing temperature. For the elements carbon, silicon, and germanium, this coefficient is a negative number, meaning that resistance decreases with increasing temperature.

For some metal alloys, the temperature coefficient of resistance is very close to zero, meaning that the resistance hardly changes at all with variations in temperature ( a good property if you want to build a precision resistor out of metal wire).

40
Q
  1. Conductance is defined as the:
    (a) The ease at which current flows through a conductor.
    (b) The opposition to current flow through a conductor.
    (c) The amount of heat a conductor emits with current flow.
A

(a) The ease at which current flows through a conductor.

41
Q
  1. If the resistance of an electrical circuit is increased
    (a) the voltage will increase
    (b) the current will increase
    (c) the current will decrease
A

(c) the current will decrease

42
Q
  1. The voltage drop in a conductor of known resistance is dependant on:
    (a) the voltage of the circuit
    (b) the amperage of the circuit
    (c) only the resistance of the circuit and does not change in either voltage or amperage.
A

(b) the amperage of the circuit

43
Q
  1. In general, increasing the cross sectional area of an electrical cable
    (a) enables it to carry more current
    (b) enables it to carry more voltage
    (c) increases its resistance
A

(a) enables it to carry more current

44
Q
  1. The amount of electron flow through a conductor would be increased by the greatest amount, if the:
    (a) Cross-sectional area and length were both increased
    (b) Cross-sectional area and length were both decreased
    (c) Cross-sectional area increased and length decreased
A

(c) Cross-sectional area increased and length decreased

45
Q
  1. In which of the following cases will a potential difference not exist?
    (a) between two identical positive charges
    (b) between a positive charge and an equal negative charge
    (c) between a charged body and an uncharged body
A

(a) between two identical positive charges

46
Q
  1. Current in an electric circuit is caused by which of the following actions?
    (a) Electrons moving from negative to positive
    (b) Electrons moving from positive to negative
    (c) Protons moving from negative to positive
    (d) Protons moving from positive to negative
A

(a) Electrons moving from negative to positive

47
Q
A

Option C: photodiode

48
Q
A

Option C: the magnitude of the EMF is directly proportional to the rate of change of flux

49
Q
A

Option A: 1000 mA

50
Q
A

Option C: impedance

51
Q
A

Option B: Current = e.m.f divided by resistance

52
Q
A

Option A: MMF

53
Q
A

Option A: Generators

54
Q
A

Option A: Kilogram metres-force

Work is measured in joules, which is Newton.metres or kilogram.metres force (since Newtons are Kilograms force)

55
Q
A

Option c: one ampere per second

Current (Amps) = Charge (Coulombs) per second

56
Q
A

Option B: electrons from a negatively charged area to a positively charged area

57
Q
A

Option C: unit of electrical pressure

Electrical pressure’ is sometimes used instead of voltage, due to its analogy to a head of pressure in fluids

58
Q
A

Option A: 3,250 millivolts

59
Q
A

Option C: Volts

EMF is another term for voltage, or potential difference (PD) or electrical pressure, all measured in volts

60
Q
A

Option A: the algebraic sum of all voltages entering or leaving a series of components will be equal to zero

61
Q
A

Option A: inductance

62
Q
A

Option C: mutual induction

63
Q
A

Option B: the loss of continuity will prevent its component from functioning

64
Q
A

Option C: Tesla

65
Q
A

Option B: 0.000,001 Farads

66
Q
A

Option A: inductive reactance

67
Q
A

Option A: An ammeter

A shunt is used to change the working range of an ammeter, by ‘shunting’ around the ammeter, a major portion of the current being measured.

68
Q
A

Option A: the corkscrew rule

69
Q
A

Option A: Joules per second

Power = energy (joules) / time (seconds)

70
Q
A

Option C: motors

71
Q
A

Option B: Faraday’s Law

72
Q
A

Option C: Joules per second

Power = Energy(J) / Time(s)

73
Q
A

Option A: B

74
Q
A

Option C: the corkscrew rule

75
Q
A

Option C: mutual inductance

76
Q
A

Option C: -L dl / dt

77
Q
A

Option C: permeability

78
Q
A

Option A: I * N

MMF (symbol H) = amps * turns (units are ampere turns)

79
Q
A

Option B: Faraday’s Law

Faraday’s Law is induced EMF is directly proportional to the rate of change of flux

80
Q
A

Option B: Fleming’s right hand rule

If current is induced, created therefore must be generator - Ryan Gigs (Right Hand Rule - Generator)

81
Q

(assuming conventional current flow)

A

Option A: Flemings left hand rule

Note: If current going into armature, must be motor and therefore Lionel Messi (Left Hand Rule for Motor)

82
Q
A

Option B: Siemen

Conductance is 1/R and is measured in Siemens /Mho

83
Q
A

Option B: Ohm metre

84
Q
A

Option B: 1/R

Conductance (mho/siemens) (diagram symbol G) is the inverse of resistivity

G = 1/R

85
Q
A

Option B: Watt

86
Q
A

Option A: Newton-meter which is Joules

Work has the same unit as energy i,e Nm or Joule

87
Q
A

Option A: Joule

88
Q
A

Option A: voltage

Potential difference, electromotive force, electrical pressure, are all terms for voltage

89
Q
A

Option A: inductive reactance

‘’L’’ is for inductance, ‘’X’’ is for reactance

90
Q
A

Option B: current is directly proportional to the EMF

91
Q
A

Option C: 1 Henry

1 Henry = 1 Volt per Amp per Second

92
Q
A

Option B: resistance

93
Q
A

Option C: closed loop networks

94
Q
A

Option C: Joule

95
Q
A

Option A: Faraday’s law

96
Q
  1. 3 amperes flow for 15 seconds. How many coulombs has flowed?
    (a) 5
    (b) 45
    (c) 135
A

(b) 45

Q = I*T

Where Q is charge in Coulombs, I is current in Amps and T is time in seconds

Q = (3A)*(15s) , Q = 45C

Module 3: Electrical Fundamentals (B1) :!: (19 decks)

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