Extra P2

Question 1

What is the alternative to fuses?

Answer 1

Circuit breakers

Question 2

Improve reliability of circuits?

Answer 2

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

Question 3

How is earth wire safe?

Answer 3

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.

Question 4

Milli

Answer 4

1000

Question 5

What are some other utilities?

Answer 5

Backup and firewall

Question 6

What is the role of the OS?

Answer 6

interface, cpu, memory management and security.

Question 7

How does the OS do interface?

Answer 7

User/software and software/hardware

Question 8

How does the OS do cpu?

Answer 8

Pipelining, scheduling to allow for optimal cpu usage.

Question 9

How does the CPU do memory management?

Answer 9

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

Question 10

How does the OS do security?

Answer 10

User profiles/access levels and encyption

Question 11

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

Answer 11

No.

Question 12

What does compression as a whole do?

Answer 12

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

Question 13

What is the symbol for a variable resistor?

Answer 13

look to your right

Question 14

What is the OS?

Answer 14

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

Question 15

What are some negatives of bus networks?

Answer 15

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

Question 16

What happens on the application layer?

Answer 16

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

Question 17

What does a WAP use?

Answer 17

A radio transceiver to allow wireless connections to a network.

Question 18

What is a server?

Answer 18

Computer that provides a service to the clients.

Question 19

What is a positive of star networks?

Answer 19

More secure as data is only received from one node.

Question 20

What is hardware?

Answer 20

Physical components that make up a computer.

Question 21

Do embedded systems have much RAM?

Answer 21

No as programs are run from secondary storage.

Question 22

What is a computer?

Answer 22

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

Question 23

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

Answer 23

The bios hands over control to the OS.

Question 24

How many bytes does unicode use?

Answer 24

4

Question 25

Total energy

Answer 25

Remains constant

Question 26

Output power of solar panel is what?

Answer 26

Energy

Question 27

Why are step-up transformers used?

Answer 27

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

Question 28

What is a potential difference of 1 volt?

Answer 28

1 joule per coulomb

Question 29

Why does charge build up on metal plates?

Answer 29

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

Question 30

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

Answer 30

``` 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 ```

Question 31

AND

Answer 31

dot inbetween two letters.

Question 32

or

Answer 32

plus sign

Question 33

not

Answer 33

line above or below

Question 34

xor

Answer 34

circle with plus sign in like a proton

Question 35

How many parameters is (money-price)

Answer 35

1

Question 36

Does bus or star use less cabling?

Answer 36

Bus

Question 37

Why is star more expensive?

Answer 37

Because it uses hub/switch

Question 38

What is harvard architecture?

Answer 38

Data and instructions stored separately

Question 39

Computational thinking?

Answer 39

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

Question 40

Empty space

Answer 40

Unnecessary increase in file size

Question 41

Entity?

Answer 41

thing (table)

Question 42

What to do in 9 marker?

Answer 42

Link back to question, 2 pos 2 neg with impacts

Question 43

Can star add infinite devices?

Answer 43

No only limited as hub/switch has a limit

Question 44

Can bus add infinite devices?

Answer 44

yes but bad

Question 45

What does an earthing wire do?

Answer 45

Prevent charge building up on object

Question 46

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

Answer 46

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

Question 47

What is the fuse connected between?

Answer 47

The live pin and wire

Question 48

What causes electrons to be rubbed off?

Answer 48

Friction

Question 49

What do transformers do?

Answer 49

lower current so less power loss

Question 50

What are consumer wires

Answer 50

Shorter so less power loss