Mock P4,5,7,11

Question 1

An electric current is

Answer 1

The flow of charge

Question 2

Charge flow =

Answer 2

Current x time taken

Question 3

Resistance =

Answer 3

Potential difference over current

Question 4

Ohmic conductors

Answer 4

Have fixed resistance if their temperature doesn’t change

Question 5

Current flowing is directly proportional to

Answer 5

The potential difference

Question 6

What happens in a series circuit if you remove one component

Answer 6

Circuit is broken

Question 7

Total pd in a series circuit is

Answer 7

Shared between components

Question 8

Total resistance found in a seroes corcuit by

Answer 8

Adding the components

Question 9

Each component in a parallel circuit

Answer 9

Is separately connected to the ends of the power supply

Question 10

All compensnts in parralwl circuits

Answer 10

Get the full source pd

Question 11

Brown wire is the

Answer 11

Live wire

Question 12

Live wire

Answer 12

Carries the alternating current from the supply

Question 13

The blue wire is the

Answer 13

Neutral wire

Question 14

Neutral wire

Answer 14

Completes the circuit

Question 15

Green wire is the

Answer 15

Earth wire

Question 16

The earth wire

Answer 16

Is the sadety wire.Stops the device becoming “live”

Question 17

Direct current

Answer 17

Flows in one direction

Question 18

Alternating current

Answer 18

Constantly changes dorection.

Question 19

National grid

Answer 19

System of cable and transformer

Question 20

National grid allows

Answer 20

Electricity to be delivered to your homes safely

Question 21

Cables are made of

Answer 21

Aluminium

Question 22

Why are the cables made out of aluminium

Answer 22

So it’s light

Question 23

Step up transformer

Answer 23

Increases voltage and reduces the current

Question 24

Step dlwn transformer

Answer 24

Reduces the voltage and increases the current

Question 25

Advantages of pylons

Answer 25

Cheap. Open to air cooling of cables

Question 26

Disadvantages of pylons

Answer 26

Ugly,ruin landscape. Vulnerable to weather Must cut across large amounts of land

Question 27

Issues with underground power cables

Answer 27

Lots of digging Expensive Maintenance a lot harder. Cables get rlly hot underground

Question 28

Nuclear radiation

Answer 28

When the nucleus of an atom wmkts radiation because it is unstable

Question 29

Three types of nuclear radiation

Answer 29

Alpha radiation Beta radiation Gamma radiation

Question 30

Ionising radiation

Answer 30

When radiation collides with neutral atoms or molecules it alters their structure

Question 31

Alpha particles made up of

Answer 31

2 protons and 2 neutrons

Question 32

Beta particles

Answer 32

Is an electron created and emitted by a nuckeaus which has too many neutrons compared to protons

Question 33

Gamma particles is

Answer 33

Emmited by an unstable nucei after an alpha or beta has been emitted

Question 34

Half life is

Answer 34

The number of nuclei of the radioactive isotope in a sample to halve