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zPhysics > Extra P2 > Flashcards

Extra P2 Flashcards

1
Q

What is the alternative to fuses?

A

Circuit breakers

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2
Q

Improve reliability of circuits?

A

Repeat to find average, make sure meters are zeroed, use the same bulb

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3
Q

How is earth wire safe?

A

IT BLOWS THE FUSE STOPPING CURRENT FROM FLOWING THE CASE IS NO LONGER LIVE and what you already know about it connecting to the ground.

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4
Q

Milli

A

1000

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5
Q

What are some other utilities?

A

Backup and firewall

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6
Q

What is the role of the OS?

A

interface, cpu, memory management and security.

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7
Q

How does the OS do interface?

A

User/software and software/hardware

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8
Q

How does the OS do cpu?

A

Pipelining, scheduling to allow for optimal cpu usage.

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9
Q

How does the CPU do memory management?

A

Moves data and instruction sbetween primary+secondary storage and also disk defrag.

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10
Q

How does the OS do security?

A

User profiles/access levels and encyption

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11
Q

When you right the encoding for huffman do you leave a space?

A

No.

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12
Q

What does compression as a whole do?

A

Uses an algorithm to remove repeating and unnecessary data to reduce file size.

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13
Q

What is the symbol for a variable resistor?

A

look to your right

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14
Q

What is the OS?

A

the low-level software that supports a computer’s basic functions, such as scheduling tasks and controlling peripherals.

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15
Q

What are some negatives of bus networks?

A

Every workstation on the network sees all the of the data and cabling issues are hard to isolate as all computers are affected.

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16
Q

What happens on the application layer?

A

Encodes/decodes message into a form that is understood by the sender and recipient devices

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17
Q

What does a WAP use?

A

A radio transceiver to allow wireless connections to a network.

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18
Q

What is a server?

A

Computer that provides a service to the clients.

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19
Q

What is a positive of star networks?

A

More secure as data is only received from one node.

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20
Q

What is hardware?

A

Physical components that make up a computer.

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21
Q

Do embedded systems have much RAM?

A

No as programs are run from secondary storage.

22
Q

What is a computer?

A

A programmable device that takes in data, processes it into useful information and then outputs the useful information so it can be used.

23
Q

What is the final stage of the start-up sequence?

A

The bios hands over control to the OS.

24
Q

How many bytes does unicode use?

A

4

25
Q

Total energy

A

Remains constant

26
Q

Output power of solar panel is what?

A

Energy

27
Q

Why are step-up transformers used?

A 
increase voltage (1)
 decrease current (1)
 reduce {loss / waste} of
{energy / heat} (1)
28
Q

What is a potential difference of 1 volt?

A

1 joule per coulomb

29
Q

Why does charge build up on metal plates?

A 
Metal is a conductor (1)
 Electrons / ( negative )
charge moves (through the
plates/ wire) (1)
 Towards the voltage
supply / earth /ground
30
Q

Aircrafts connected by metal cable to ground and it is connected by cable to refueler, how does this help?

A 
Metals are (good) conductors (1)
Electrons/(negative) charge can
flow through wire (1)
charge goes from/to the ground /
earth (1)
discharge the tank/aircraft/pipes
31
Q

AND

A

dot inbetween two letters.

32
Q

or

A

plus sign

33
Q

not

A

line above or below

34
Q

xor

A

circle with plus sign in like a proton

35
Q

How many parameters is (money-price)

A

1

36
Q

Does bus or star use less cabling?

A

Bus

37
Q

Why is star more expensive?

A

Because it uses hub/switch

38
Q

What is harvard architecture?

A

Data and instructions stored separately

39
Q

Computational thinking?

A

Is used to turn a problem into something a computer can help you solve

40
Q

Empty space

A

Unnecessary increase in file size

41
Q

Entity?

A

thing (table)

42
Q

What to do in 9 marker?

A

Link back to question, 2 pos 2 neg with impacts

43
Q

Can star add infinite devices?

A

No only limited as hub/switch has a limit

44
Q

Can bus add infinite devices?

A

yes but bad

45
Q

What does an earthing wire do?

A

Prevent charge building up on object

46
Q

Why can you not get a shock if you touch the metal case?

A

Case is kept at same potential as earth so cannot get a shock if it is touched

47
Q

What is the fuse connected between?

A

The live pin and wire

48
Q

What causes electrons to be rubbed off?

A

Friction

49
Q

What do transformers do?

A

lower current so less power loss

50
Q

What are consumer wires

A

Shorter so less power loss

zPhysics (9 decks)

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