P2

Question 1

Current

Answer 1

Flow of charge around a circuit

Question 2

Potential difference

Answer 2

Forge pushing current around a circuit

Question 3

Resistance

Answer 3

Anything that reduces the flow of current

Question 4

Current units

Answer 4

Amperes, A

Question 5

P D units

Answer 5

Volts, V

Question 6

Resistance units

Answer 6

Ohms, (omega)

Question 7

Ohmic conductor graph

Answer 7

• straight line
• R is constant

Question 8

Filament lamp graph

Answer 8

• ‘S’ line
• R increases
• Temp increases

Question 9

Diode graph

Answer 9

• straight line diagonal after straight line horizontally

Question 10

Series circuit current

Answer 10

Same everywhere

Question 11

Series circuit PD

Answer 11

Shared
- all add up

Question 12

Series circuit resistance

Answer 12

Shared
-all add up

Question 13

Parallel circuit current

Answer 13

Shared
- all add up

Question 14

Parallel circuit PD

Answer 14

Same everywhere

Question 15

Parallel circuit resistance

Answer 15

Total resistance is less than the smallest resistance

Question 16

Blue wire

Answer 16

Neutral
- completes circuit

Question 17

Brown wire

Answer 17

Live
- supplies current

Question 18

Green + yellow wire

Answer 18

Earth
- stops appliance becoming live

Question 19

ohm’s law

Answer 19

voltage across a conductor is directly proportional to the current flowing through it

Question 20

work out series circuit resistance

Answer 20

add all resistances up

Question 21

work out resistance of parallel circuit

Answer 21

1/R1 + 1/R2 + 1/R3

Question 22

specific latent heat

Answer 22

energy required to change state of 1kg of a substance without changing its temperature

Question 23

internal system

Answer 23

total energy stored within a system

Question 24

radioactivity unit

Answer 24

becquerels (bq)

Question 25

electricity practical

Answer 25

- place crocodile clip on wire at 0m - place second croc clip 10 cm from first - close the switch and record current and pd - move second clip further along, and other 10 cm eg and record again - repeat for number of values - work our resistance and plot on graph w line of best fit

Question 26

Potential difference supply (series)

Answer 26

Shared - all add up

Question 27

Current supply (series)

Answer 27

Same everywhere

Question 28

Resistance supply (series)

Answer 28

Adds up Rtotal = R1+R2

Question 29

newtons 1st law

Answer 29

if the resultant force acting on a stationary object is 0, the object will remain stationary eg. car is moving by 50N, it will remain at a constant speed

Question 30

newtons 2nd law

Answer 30

the acceleration of an object is proportional to the resultant force acting on it, and inversely proportional to the mass of the object

Question 31

newtons 3rd law

Answer 31

for every action, there is an equal and opposite reaction eg. object 1 exerts force on object 2, object 2 simultaneously exerts a force equal in magnitude and opposite in direction

Question 32

ohmic conductor graph why?

Answer 32

current through an ohmic conductor (at constant temperature) is directionally proportional to PD therefore, a straight line

Question 33

filament lamp graph why?

Answer 33

as current increases, temp of filament increases, so resistance increases this means less current can flow per unit PD therefore, graph gets shallower, curve

Question 34

diode graph why?

Answer 34

current will only flow through a diode in one direction diode has very high resistance in reverse direction