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Eleccy > 202/302 Principles > Flashcards

202/302 Principles Flashcards

1
Q

What is the force of gravity on earth?

A

9.81 Newtons

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2
Q

What is the symbol for temperature coefficient of resistance?

A

a (Alpha)

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3
Q

What is a conductor in terms of atoms?

A

Lots of free electrons in outer shell

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4
Q

What is an insulator in terms of atoms?

A

Few free electrons in outer shell

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5
Q

What is the multiplier and symbol for Pico?

A

p 10(-12)

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6
Q

What is the multiplier and symbol for Nano?

A

n 10(-9)

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7
Q

What is the multiplier and symbol for Micro?

A

u/p shape 10(-6)

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8
Q

What is the multiplier and symbol for Milli?

A

m 10(-3)

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9
Q

What is the multiplier and symbol for Kilo?

A

k 10(3)

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10
Q

What is the multiplier and symbol for Mega?

A

M 10(6)

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11
Q

What is the multiplier and symbol for Giga?

A

G 10(9)

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12
Q

What is the multiplier and symbol for Tera?

A

T 10(12)

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13
Q

What is resistance measured in?

A

Ohms

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14
Q

What are the dimension symbol and unit for luminous intensity?

A

Iv. Candela

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15
Q

What are the 8 multipliers?

A

Tera. Giga. Mega. Kilo. Milli. Micro. Nano. Pico

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16
Q

What is the symbol for luminous intensity?

A

cD

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17
Q

What is the formula for average power?

A

Average power = Work done ÷ Time (P=WD/T)

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18
Q

What is the formula for work done?

A

Work done = Force x Distance (W=FD)

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19
Q

What is the formula for kinetic energy?

A

Kinetic energy = 1/2 x Mass x Velocity(2)
(1/2MV(2)

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20
Q

What is the formula for potential energy?

A

Potential energy = Mass x Acceleration x height (PE=mah)

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21
Q

What is the formula for force?

A

Force = Mass x Acceleration (F=ma)

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22
Q

What is the formula for voltage?

A

Voltage = Current x Resistance (V=IR)

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23
Q

What is the formula for power?

A

Power = Current x Voltage (P=IV)

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24
Q

What is ohms law?

A

Resistance = voltage ÷ current

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25
Q

What is the formula for voltage drop?

A

(Mv/A/M) x Ib x L ÷ 1000

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26
Q

How do you find the total resistance in a circuit?

A

Add up the value of all resistors

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27
Q

Where in the On-Site Guide is Ca?

A

Table F1

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28
Q

Where in the On-Site Guide is In?

A

Table B6

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29
Q

Where in the On-Suite Guide is Cg?

A

Table F3

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30
Q

Where in the On-Suite Guide is Cf?

A

Appx F

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31
Q

Where in the On-Suite Guide is cable size and voltage drop?

A

Table F6

32
Q

Where in the On-Suite Guide is Ci?

A

Table F2

33
Q

What are the 3 types of conduit?

A

Metal. PVC. Flexible

34
Q

What is the formula for Iz?

A

In ÷ (Ca x Cf x Cg x Ci)

35
Q

What is the formula for Phi?

A

Phi = Beta x Area

36
Q

What does magnetic current flowing away appear as?

A

A cross

37
Q

What does magnetic current flowing towards appear as?

A

A point

38
Q

What magnetic field is represented as a point?

A

Anticlockwise magnetic field

39
Q

What magnetic field is represented as a cross?

A

Clockwise magnetic field

40
Q

What is the formula for flux density?

A

Flux density = Current x Length
(Beta = IL)

41
Q

What is the formula for magnetic force?

A

Magnetic force = Magnetic flux x Current x Length

42
Q

What is magnetism?

A

The result of a movement of electrons

43
Q

What is flux density measured in?

A

Tesla

44
Q

What is the symbol for flux density?

A

B (Beta)

45
Q

Which hand is used to determine the magnetic direction of a motor?

A

Left

46
Q

Which hand is used to determine the magnetic direction of a generator?

A

Right

47
Q

What is the difference between motors and generators?

A

Motors require electricity to spin. Generators spin to generate electricity

48
Q

What does the thumb point to in a generator and motor?

A

Direction of motion

49
Q

What does the 1st finger point to in a generator and motor?

A

Polarity of field

50
Q

What does the 2nd finger point to in a generator and motor?

A

Polarity convectional current

51
Q

What is the formula for parallel resistance?

A

R1(x-1) + R2 (x-1) + R3 (x-1) = RT RT (x-1)

52
Q

What is the formula for series resistance?

A

R1 + R2 + R3 = RT

53
Q

Why do we use a.c for distribution and transmission?

A

It reduces heat loss, energy loss and cost

54
Q

At what voltage is electricity generated at?

A

20 - 27kV

55
Q

What voltage is electricity transmitted at the grid system?

A

400kV or 275kV

56
Q

What is the value of RMS?

A

0.707

57
Q

What is the value of average?

A

0.363

58
Q

How is a magnetic field created in a generator?

A

A D.C supply is added

59
Q

What rotates the rotor in a generator?

A

The prime mover

60
Q

How much energy never reaches the consumer due to heat?

A

8%

61
Q

What are two negatives about pylons?

A

They are ugly, they use lots of land

62
Q

What are 2 positives about pylons?

A

They are cheaper than installing cables, They do not require insulators

63
Q

What is the maximum super grid voltage?

A

400kV

64
Q

How many volts are considered extra low?

A

0 - 50 volts

65
Q

What is the formula for working out transformer ratios?

A

VP÷VS NP÷NS IS÷IP

66
Q

What does an AFDD protect against?

A

Fire

67
Q

What does an AFDD stand for?

A

Arc fault detection device

68
Q

What does SPD stand for?

A

Surge protection device

69
Q

What does an SPD protect against?

A

Over Voltage

70
Q

Why would someone choose to install a ring circuit?

A

To reduce voltage drop, to reduce losses on the final accessory

71
Q

Which phase supplies are installed in newer homes?

A

3-phase

72
Q

How much are the 3 phases out of each other?

A

120⁰

73
Q

What’s positive about using 3-phase?

A

requires x2 the number of wires for x3 the power

74
Q

How much is the voltage between each phase?

A

1.37 (Square root of 3?

75
Q

What are the 4 types of isolation and switching?

A

Switching for mechanical maintenance,
Emergency switch off,
Functional switching,
Firefighters switch

Eleccy (9 decks)

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