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Science > Household electricity > Flashcards

Household electricity Flashcards

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1
Q

What does AC stand for

A

Alternating current

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2
Q

What does DC stand for

A

Direct current

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3
Q

Things running off batteries run off

A

DC

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4
Q

What is the frequency in the UK

A

50Hz

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5
Q

What is the PD in the UK

A

230Volts

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6
Q

What can measure voltage

A

Oscilloscope (and voltmeters)

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7
Q

Where do you measure the voltage on an AC reading on a oscilloscope

A

the peak

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8
Q

What wires are found in a 3 core cable

A

Live, neutral and earth wires

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9
Q

Why is copper wire used

A

Very good conductor

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10
Q

What wires do 2 core cables have

A

Live and neutral

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11
Q

How are plugs kept safe ( 5 )

A 
1/ Tough plastic case (plastic doesn't conduct electricity)
2/ Flexible, plastic cable
3/ Cable grip, or cord grip
4/ Fuse 
5/ Insulated wires
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12
Q

What does the fuse do

A

Melts if the current gets too high

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13
Q

What is the brown wire and where is it located

A

The live wire, the right

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14
Q

What is the blue wire and where is it located

A

The neutral wire, the left

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15
Q

What is the yellow/green wire and where is it located

A

The earth wire, the middle

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16
Q

What are the wires plugged into

A

Earth, live and neutral pins

17
Q

What wire is not found in 2 core plugs

A

Earth wire

18
Q

What appliances have 2 core cables

A

Double insulated appliances

19
Q

What appliances have 3 core cables

A

Metal cases appliances

20
Q

Why is the earth wire required for metal cases appliances

A

In case the live wire came into contact with the metal case.

21
Q

Why does the fuse burn if anything goes in the earth wire

A

The wire has low resistance so current goes up and fuse detects this

22
Q

What does RCCB stand for

A

Residual current circuit breaker

23
Q

What does an RCCB do

A

adds a layer of protection

24
Q

How does RCCBs detect problems

A

Detects difference in current between live and neutral wire

25
Q

What are the advantages of RCCBs ( 2 )

A

1/ Quicker

2/ Can be reset

Science (12 decks)

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