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plumbing > plumbing science > Flashcards

plumbing science Flashcards

1
Q

what is the domestic voltage

A

230 volts

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2
Q

what is the power triangle

A

w av

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3
Q

what is the ohms law triangle

A

v ir

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4
Q

what does ac stand for

A

alternating current

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5
Q

what does dc stand for

A

direct current

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6
Q

what is alternating current

A

mains electricity

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7
Q

what is direct current

A

batteries

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8
Q

what is the letter for voltage

A

v

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9
Q

what is the letter for current

A

i

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10
Q

what is the letter for resistance

A

r

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11
Q

what is the letter for watts

A

w

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12
Q

what s the letter for joules

A

j

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13
Q

what is emf

A

electromotive force

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14
Q

what happens with a higher voltage

A

greater the force

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15
Q

what is current measured in

A

amps

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16
Q

what is resistance measured in

A

ohms

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17
Q

what does resistance do

A

opens the flow of current

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18
Q

why is an appliance never 100%

A

because some power is absorbed

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19
Q

what are joules

A

unit of electric energy

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20
Q

how many is a kilowatt

A

1000

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21
Q

what are the current and amps to do with

A

fuse

22
Q

what is an appliance

A

immersion heater

23
Q

how are electricity builds measured

A

kilowatt per hour

24
Q

what does cathode eat away

A

anode

25
Q

is the anode positive or negative

A

negative

26
Q

what does tns stand for

A

terre neutral separate

27
Q

what does tncs stand for

A

terre neutral combine separate

28
Q

what does tt stand for

A

terra terra

29
Q

what is tns

A

when live neutral and earth all come from separate points

30
Q

what is tncs

A

when live goes alone and earth and neutral are together

31
Q

what is tt

A

when neutral and live are separate and earth connects to an earth rood

32
Q

what voltage are sockets in domestics

A

230v single phase

33
Q

when does the circuit breaker trip out

A

when overload is detected

34
Q

what does rcd stand for

A

residual circuit breakers

35
Q

what does rcbo stand for

A

residual current breaker with overload

36
Q

What is the SI base unit for length?

A

Metre

37
Q

Which unit is used to measure mass in the SI system?

A

Kilogram

38
Q

The Kelvin temperature scale has its zero point at what temperature?

A

Absolute zero (-273°C)

39
Q

What is the SI unit of force?

A

What is the SI unit of force?

40
Q

How many Pascals are equivalent to 1 bar of pressure?

A

100,000 Pa

41
Q

Which property measures the resistance of a material to deformation or bending?

A

Hardness

42
Q

What is the specific heat capacity of water?

A

4.19 kJ/kg°C

43
Q

Which metal is ferrous?

A

Steel

44
Q

Which plastic is used for underground cold water mains?

A

MDPE

45
Q

What type of heat transfer occurs in solids through direct contact?

A

Conduction

46
Q

What happens to water when it freezes?

A

Its density decreases.

47
Q

What is the process of water changing directly from ice to vapor called?

A

Sublimation

48
Q

What type of corrosion occurs due to high flow rates and turbulence in pipes?

A

Erosion corrosion

49
Q

Which gas has a specific gravity less than 1?

A

Helium

50
Q

What is the term for the ability of water to flow between narrow spaces?

A

Capillarity

51
Q

What is the main gas component in natural gas?

A

Nitrogen

52
Q

Which type of plastic becomes brittle in freezing temperatures?

A

Thermoplastics

plumbing (3 decks)

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