2.4- Using Mains Electricity Safely And The Power Of Electrical Appliances Flashcards
1
Q
Cells and batteries supply what type of current?
A
Direct
2
Q
Frequency and voltage of household electricity
A
> 50Hz
>230V
3
Q
What metal are plug pins made from?
A
Brass
4
Q
What colour is the live wire in a plug?
A
Brown
5
Q
What wire, in a plug, is blue?
A
Neutral
6
Q
What colour is the earth wire in a plug?
A
Green and yellow
7
Q
What happens if the current on a plug becomes too high?
A
The fuse will melt, breaking the current
8
Q
Why are RCCBs better than fuses
A
They are faster as they detect a difference in voltage on the live and neutral wire
9
Q
The thicker the wire…
A
The higher the fuse value (because a thin wire would melt as easy as a fuse)
10
Q
Why are CFLs better than filament bulbs?
A
CFLs waste less energy through heat
