plumbing science Flashcards
what is the domestic voltage
230 volts
what is the power triangle
w av
what is the ohms law triangle
v ir
what does ac stand for
alternating current
what does dc stand for
direct current
what is alternating current
mains electricity
what is direct current
batteries
what is the letter for voltage
v
what is the letter for current
i
what is the letter for resistance
r
what is the letter for watts
w
what s the letter for joules
j
what is emf
electromotive force
what happens with a higher voltage
greater the force
what is current measured in
amps
what is resistance measured in
ohms
what does resistance do
opens the flow of current
why is an appliance never 100%
because some power is absorbed
what are joules
unit of electric energy
how many is a kilowatt
1000
what are the current and amps to do with
fuse
what is an appliance
immersion heater
how are electricity builds measured
kilowatt per hour
what does cathode eat away
anode
is the anode positive or negative
negative
what does tns stand for
terre neutral separate
what does tncs stand for
terre neutral combine separate
what does tt stand for
terra terra
what is tns
when live neutral and earth all come from separate points
what is tncs
when live goes alone and earth and neutral are together
what is tt
when neutral and live are separate and earth connects to an earth rood
what voltage are sockets in domestics
230v single phase
when does the circuit breaker trip out
when overload is detected
what does rcd stand for
residual circuit breakers
what does rcbo stand for
residual current breaker with overload
What is the SI base unit for length?
Metre
Which unit is used to measure mass in the SI system?
Kilogram
The Kelvin temperature scale has its zero point at what temperature?
Absolute zero (-273°C)
What is the SI unit of force?
What is the SI unit of force?
How many Pascals are equivalent to 1 bar of pressure?
100,000 Pa
Which property measures the resistance of a material to deformation or bending?
Hardness
What is the specific heat capacity of water?
4.19 kJ/kg°C
Which metal is ferrous?
Steel
Which plastic is used for underground cold water mains?
MDPE
What type of heat transfer occurs in solids through direct contact?
Conduction
What happens to water when it freezes?
Its density decreases.
What is the process of water changing directly from ice to vapor called?
Sublimation
What type of corrosion occurs due to high flow rates and turbulence in pipes?
Erosion corrosion
Which gas has a specific gravity less than 1?
Helium
What is the term for the ability of water to flow between narrow spaces?
Capillarity
What is the main gas component in natural gas?
Nitrogen
Which type of plastic becomes brittle in freezing temperatures?
Thermoplastics
