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x Standard Grade Physics > USING ELECTRICITY From The Wall Socket > Flashcards

USING ELECTRICITY From The Wall Socket Flashcards

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0
Q

Describe the energy transfer in

a) toaster
b) food mixer
c) television

A

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

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1
Q

Batteries and mains supply what type of energy ?

A

Electrical energy

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2
Q

What is the power rating a measure of?

A

How much energy the appliance uses each secnd

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3
Q

What applicants have high power ratings?

A

Appliances which produce heat

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4
Q

Give power ratings for (60w, 2kw, 300w)

a) kettle
b) lamp
c) fridge

A

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

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5
Q

What power ratings use a 3A fuse?

A

Less than 675w

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6
Q

What power ratings use 13A?

A

Greater than 675w

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7
Q

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

A

13A

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8
Q

What kind of cables do high power appliances have?

A

Thick so as to carry current and prevent over heating.

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9
Q

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

A

Brown, bottom right

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10
Q

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

A

Blue, bottom left

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11
Q

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

A

Yellow and green, top

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12
Q

Does the human body conduct?

A

Yes

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13
Q

How does water affect conductivity?

A

Increases it so increases risk and severity of electrocution.

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14
Q

The earth wire is a _____ device

A

Safteey

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15
Q

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

A

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

16
Q

What does the double insulation symbol look like?

A 
\_\_\_\_\_\_\_\_\_\_\_
|   \_\_\_\_\_\_\_  |
|   |            |  |
|   |\_\_\_\_\_\_|  |
|\_\_\_\_\_\_\_\_\_ |
17
Q

Why could a wrong fuse be dangerous?

A

Will no blow; overheat and fire

18
Q

Why could a frayed wire be dangerous?

A

Risk exposure of live wire; electrocution

19
Q

Why could wrongly connected fuses be dangerous?

A

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

20
Q

Why could misuse of adapters be dangerous?

A

Draw too large a current, over heating and fire

21
Q

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

A

So that the high wire is cut off when fuse blows

22
Q

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

A

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

23
Q

Why is there an earth wire?

A

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.

x Standard Grade Physics (29 decks)

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