plumbing science Flashcards
1
Q
watts is a unit of …..
A
power
2
Q
joules is a unit of electrical ……
A
energy
3
Q
volts=watts divided by ….
A
amps
4
Q
what does ac stand for
A
alternating current
5
Q
what does dc stand for
A
direct current
6
Q
ohms is ………
A
resistance
7
Q
what are the 3 letters is the power triangle
A
V,I,R
8
Q
what are the three letters in the ohms triangle
A
W,A,V
9
Q
three earth wire sytsems
A
tns tncs tt
10
Q
what does rcd stand for
A
residual circuit breakers
11
Q
what does earth wire do
A
take electricity to the ground in case of a fault
12
Q
what does tt use to take electricity to the ground
A
earth rod
13
Q
which system are the earth and neutral wire connected
A
tncs
14
Q
Which plastic is used for underground cold water mains
A
MDPE
15
Q
What type of corrosion occurs due to high flow rates and turbulence in pipes?
A
Erosion corrosion
