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plumbing level 2 > Plumbing science > Flashcards

Plumbing science Flashcards

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1
Q

What is the unit of current

A

Unit of current is ampene.

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2
Q

What is the voltage for domestic homes

A

230-240v

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3
Q

What happens when voltage is high

A

The more voltage there is the more push on the electrons

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4
Q

What is the unit of resistance

A

Ohms

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5
Q

How to calculate current

A

Voltage/resistance

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6
Q

How to calculate voltage

A

Current X resistance

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7
Q

How to calculate resistance

A

Voltage/current

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8
Q

What does i stand for

A

Current

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9
Q

What are watts

A

Unit of power from an appliance

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10
Q

What is direct current

A

Something that provides electricity directly e.g battery(chemical)

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11
Q

What is AC

A

Alternative current is where the electricity goes through series of stages to get where it needs to go

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12
Q

what does TN(S) mean

A

separate

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13
Q

what does TN(C) mean

A

Combined

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14
Q

what is a TT earthing system

A

where the metal housing of an electrical system is placed underground.

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15
Q

domestic electrics

A

pumps
showers
thermostats
plugs/spurs
boilers
cookers

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16
Q

what can a plumber do with electrics

A

can rewire already made circuits but cannot make their own

17
Q

what’s the purpose of an RCD

A

found in modern day consumer units and trip out if they are any earth faults

18
Q

types of circuit protection

A

cartridge fuses are the older type of circuit protection and are re-wireable
plug tops have cartridge fuses inside.

19
Q

requirements for electrical installation

A

IET on-site guide
approved document part p (building regulations

20
Q

voltage to be used for safety

A

low voltage:
-230v single phase AC
-110v single phase AC
extra low voltage for safety:
-24v DC
-18v DC
-12v DC

21
Q

what is a step down transformer used for

A

used to bring voltage down

22
Q

what safety features do MCBs have

A

trip out if an earth fault happens

23
Q

why is earthing circuits done

A

to keep us safe from shock or overloading the circuit

24
Q
A

plumbing level 2 (2 decks)

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