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plumbing > Plumbing science > Flashcards

Plumbing science Flashcards

1
Q

What does “v” stand for

A

Voltage

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2
Q

What does “I” stand for

A

Current

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3
Q

What does “R” stand for

A

Resistance

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4
Q

What does “W” stand for

A

Watts

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5
Q

How much is the domestic voltage

A

230 volts

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6
Q

How do you work out voltage

A

V= I x R

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7
Q

What is DC

A

Direct current

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8
Q

What is AC

A

Alternating current

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9
Q

Example of DC

A

Battery

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10
Q

Example of AC

A

Mains electricity

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11
Q

What does the earth wire do

A

makes current pass through ground instead of the person

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12
Q

what does the live wire do

A

carries electricity from power to source

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13
Q

is TNS separate or combined

A

separate

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14
Q

is TNC separate or combined

A

combined

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15
Q

what is the purpose of an RCD

A

protects you from electric shocks and electric fires

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16
Q

where is electricity used in plumbing

A

pump
showers
thermostats
boilers
cookers

17
Q

what cant plumbers interfere with?

A

ring final and lighting circuit

18
Q

what is a safe voltage

A

low voltage:
230v single phase AC
110v single phase AC

19
Q

In a TT where does the earth rod go

A

it goes down to the ground

20
Q

what is a step down transformer used for

A

used to bring voltage down

21
Q

How many Pascals are equivalent to 1 bar of pressure?

A

100,000 Pa

22
Q

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

A

Radiation

23
Q

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

A

Deposition

24
Q

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

A

Pitting corrosion

25
Q

What is the main gas component in natural gas?

A

Methane

26
Q

What is the unit of electrical current in the SI system?

A

Watt

27
Q

Which type of plastic becomes brittle in freezing temperatures?

A

Polyethylene

plumbing (2 decks)

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