USING ELECTRICITY From The Wall Socket Flashcards Preview

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Flashcards in USING ELECTRICITY From The Wall Socket Deck (24):
0

Batteries and mains supply what type of energy ?

Electrical energy

1

Describe the energy transfer in
a) toaster
b) food mixer
c) television

a) toaster- electrical to heat
b) food mixer- electrical to kinetic
c) television- electrical to light and sound

2

What is the power rating a measure of?

How much energy the appliance uses each secnd

3

What applicants have high power ratings?

Appliances which produce heat

4

Give power ratings for (60w, 2kw, 300w)
a) kettle
b) lamp
c) fridge

a) kettle 2kw
b) lamp 60w
c) fridge 300w

5

What power ratings use a 3A fuse?

Less than 675w

6

What power ratings use 13A?

Greater than 675w

7

If an appliances has an electric motor what fuse does it use?

13A

8

What kind of cables do high power appliances have?

Thick so as to carry current and prevent over heating.

9

What colour is the live wire? Where is it found in a plug?

Brown, bottom right

10

What colour is the neutral wire? Where is it found in a plug?

Blue, bottom left

11

What colour is the live wire? Where is it found in a plug?

Yellow and green, top

12

Does the human body conduct?

Yes

13

How does water affect conductivity?

Increases it so increases risk and severity of electrocution.

14

The earth wire is a _____ device

Safteey

15

Why kind of appliances do not require an earth wire? Why?

Appliances with double insulation because there is no risk of electrocution from the casing. (2core flex)

16

What does the double insulation symbol look like?

___________
| _______ |
| | | |
| |______| |
|_________ |

17

Why could a wrong fuse be dangerous?

Will no blow; overheat and fire

18

Why could a frayed wire be dangerous?

Risk exposure of live wire; electrocution

19

Why could wrongly connected fuses be dangerous?

Short circuit could over heat and cause fire or earth wire may not function properly

20

Why could misuse of adapters be dangerous?

Draw too large a current, over heating and fire

21

Why must the fuse wire be connected to the live wire?

So that the high wire is cut off when fuse blows

22

Earth wire provides an easy ____ for the ____ to flow to the ____.

Earth wire provides an easy pathway for the electricity to flow to the ground.

23

Why is there an earth wire?

It is connected to the metal casing so that if a fault develops it will cause a large current to pass through the live wire and and the fuse will blow, preventing an electric shock.