science in plumbing

Question 1

what is AC

Answer 1

alternating current

Question 2

what is DC

Answer 2

direct current

Question 3

what is the symbol for AC

Answer 3

a circle with 2 lines either side and a squiggle in the middle

Question 4

what is the symbol for DC

Answer 4

2 lines one dotted

Question 5

what is the equation for ohms law

Answer 5

current x voltage x resistance

Question 6

what are the four measurements of electrical flow

Answer 6

amps voltage ohms resistance

Question 7

what is current measured in and what is its symbol

Answer 7

amps-I

Question 8

what is voltage measured in and what is its symbol

Answer 8

volts-V

Question 9

what is resistance measured in

Answer 9

ohms

Question 10

what is power measured in and what is its symbol

Answer 10

watts-W

Question 11

If an appliance needs 3kW in a domestic property, what
is the fuse size?

Answer 11

12.5 amp.

Question 12

In a domestic property, an appliance has a fuse size of
3 amp. What is the maximum power rating of the
appliance?

Answer 12

720w or 0.72kW.

Question 13

An appliance has a 5 amp fuse and needs 1.2kW of
power. What is the voltage required?

Answer 13

240v.

Question 14

What would be the resistance of a domestic appliance
if the fuse size was 3 amp?

Answer 14

20 ohms

Question 15

what is the name of the circuit when the neutral and the earth wires don’t meet

Answer 15

TNS

Question 16

what is the name of the circuit when the neutral and the earth meet

Answer 16

TNCS

Question 17

what is the name of the circuit when it is just the earth going through an earth rod in the ground

Answer 17

TT

Question 18

Which of the following is the basic principle behind Newton’s First Law of Motion

Answer 18

an object will remain motionless unless an external force is acted upon it

Question 19

what is the si base unit for length

Answer 19

meter

Question 20

which plastic is commonly used for underfloor water mains

Answer 20

MDPE

Question 21

what is the process of water changing from ice into vapor called

Answer 21

sublimation

Question 22

what type of corrosion occurs due to high flow pressures

Answer 22

erosion corrosion

Question 23

which gas has a specific gravity less than 1

Answer 23

helium

Question 24

what is the term for water to be able to flow through a tight space

Answer 24

capillarity

Question 25

what is the main component of natural gas

Answer 25

methane