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plumbing level 2 > plumbing science > Flashcards

plumbing science Flashcards

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1
Q

unit of watts

A

w

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2
Q

unit of joules

A

j

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3
Q

unit voltage

A

v

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4
Q

unit of current

A

i

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5
Q

unit of resistance

A

r

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6
Q

what is AC

A

alternating current

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7
Q

what is DC

A

direct current

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8
Q

what is watts the measure of

A

power

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9
Q

what is joules the measure of

A

energy

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10
Q

where does alternating current come from

A

mains

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11
Q

where does direct current come from

A

batteries

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12
Q

how to work out watts

A

amps x voltage

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13
Q

how to work out voltage

A

current x resistance

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14
Q

how to work out amps

A

watts / voltage

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15
Q

equation for ohms law

A

current x voltage x resistance

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16
Q

how to work out resistance

A

voltage / current

17
Q

symbol for DC

A

2 lines with one dotted

18
Q

how to work out volts

A

watts / amps

19
Q

what does the cathode eat away

A

the anode

20
Q

what is an MCB

A

mini circuit breaker

21
Q

what is an RCD

A

residual circuit breaker

22
Q

what is an RCBO

A

residual current breaker with overload

23
Q

what are MCB and fuses used for

A

to protect the circuit and appliance

24
Q

what does the consumer unit contain

A

all MCBs, residual current device, RCDs and main Isolater

25
Q

what is the basic principle behind Newtons first law of motion

A

an object will remain in motion unless acted upon by an external force

26
Q

in a mechanical engineering system, what does the term velocity refer to

A

speed of an object in a specific direction

27
Q

in a hydraulic system, pressure is generally measured in what unit

A

pascals

28
Q

what is the primary difference between force and pressure

A

force is measured in newtons
pressure in pascals

29
Q

what material is commonly used for water pipes due to its durability and resistance to corrosion

A

copper

30
Q

which type of energy conversion is commonly found in an internal combustion engine

A

Chemical to mechanical

31
Q

what role do fluids play in a hydraulic system

A

they transfer force through pressurised liquid

32
Q

why is stainless steel sometimes preferred over other metals for plumbing in areas prone to corrosion

A

it is highly resistant to rust and corrosion

33
Q

which metal is often used for fittings in plumbing systems because of its strength and ability to resist high temperatures

A

brass

34
Q

which property measures a materials resistance to being deformed

A

hardness

35
Q

the purpose of gears in a mechanical engineering system is to

A

increase or decrease speed or torque

36
Q
A

plumbing level 2 (4 decks)

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