USING ELECTRICITY Behind The Wall Flashcards Preview

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Flashcards in USING ELECTRICITY Behind The Wall Deck (15):
0

Is household wiring in parallel or series?

Parallel so that each receives full supply voltage and so if one is switched off the rest stays on.

1

What do min fuses do?

Protect the mains wiring from overheating and causing a fire if too large a current is drawn.

2

Where are the mains fuses found?

Fuse box

3

What are circuit breakers?

Automatic switches which trigger when too large a current is drawn.

4

What is a kilowatt hour?

A unit of energy.

5

1kwH=

1kw for one hour

6

Are ring circuits parallel or series?

Parallel

7

What are advantages of ring circuits?

Less current in each wire as there is more than one path
Thinner cable can be use since there is shared current
Less risk of ever heating as there is smaller current

8

What are the differences between power and lightning circuits?

Lighting Sockets

Simple parallel Ring
5A max 30A max
Thin cable Thick cables

9

What are advantages of circuit breakers?

They can be reset

10

How do you convert kilowatt hours into joules?

Change kilowatts into watts and hours into seconds then p=et

11

What is the national grid?

The service that gives electricity to homes

12

is the lighting circuit in series or parallel?

Parallels

13

What size of fuse does the lighting circuit have?

5A

14

What size of fuse does the ring main circuit have?

30A