plumbing science Flashcards
the units for voltage
V
the units for current
i
units for resistance
R
what’s watt the measure of
power
what’s the equation for ohms law
current x voltage x resistance
what is the symbol for DC
2 lines one dotted
how to work out resistance
voltage/current
how to work out voltage
current x resitance
What would be the resistance of a domestic appliance
if the fuse size was 3 amp?
80 ohms.
What is the fuse size for a domestic appliance which
has 1,200 ohms resistance?
0.2 amp.
If an appliance had a fuse rated at 13 amp and the
resistance was 32 ohms, what would the voltage be?
416v
what does AC stand for
alternative current
what does DC stand for
direct current
what colour is the earth wire
green and yellow
where does the alternative current come from
the mains electricity
where does direct current come from
batteries
what does MCB stand for
Minatare circuit breaker
What does TNCS stand for
Tera Neutral Combined Separate
What does TT stand for
‘T’ is French for Terra, which translates to earth.
why is earthing circuit done
to keep you safe
What is the SI base unit for length?
meters
What is the SI unit of force?
Newton
How many Pascals are equivalent to 1 bar of pressure?
100,000 Pa
What is the specific heat capacity of water?
4.19 kJ/kg°C
What type of heat transfer occurs in solids through direct contact?
Conduction
Which gas has a specific gravity less than 1?
Helium
What is the main gas component in natural gas?
Methane
What is the unit of electrical current in the SI system?
Ampere
Which type of plastic becomes brittle in freezing temperatures?
Thermoplastics
