8.7 Our Household Electricity

Question 1

Some work on heating effect of current, they have ______, usually nichrome wires.
Energy conversion

Answer 1

Heating elements
Current flows through wire, electrical to thermal

Question 2

How does filament bulb work

Answer 2

Current flows through tungsten filament filament hot, glows, produces light

Question 3

Moving parts of appliances are driven by _____, makes use of magnetic effect to work

Answer 3

Electric motors

Question 4

Appliances are _____ useful for diff purposes

Answer 4

Energy converters

Question 5

Where home appliances get power fr
How transmit

Answer 5

Mains electricity
Generated in power stations, through electric cables

Question 6

Mains voltage in HK
Why appliances may not be used in diff counties

Answer 6

220 V
Mains voltage varies fr countries to countries

Question 7

Connect to mains electricity

Answer 7

Insert plug into mains socket

Question 8

Three-pin plug
Mains socket holes

Answer 8

MAINS SOCKET

      Earth  Neutral    Live

Question 9

Earth, neutral, live wire colours
Uses

Answer 9

Earth- green-and-yellow
Neutral- blue
Live- brown

(Live, neutral responsible for delivering electricity to appliances)
- Live carries voltage that drives current flowing through appliance
- Neutral provides w return path for current to complete circuit
- Earth safety device

Question 10

How mains electricity is supplied to mains socket

Answer 10

Mains electricity -> electric cable -> consumer unit of home -> distributes electricity to sockets

Question 11

How mains sockets connected in domestic circuit
Why

Answer 11

Parallel
Appliances operate independently