Energy

Question 1

What is a system?

Answer 1

An object or a group of objects that interact with each other

Question 2

what are the 8 stores of energy?

Answer 2

thermal, kinetic, nuclear, sound, gpe, chemical, electrical, elastic potential

Question 3

what is the conversation of energy?

Answer 3

the fact energy can not be created or destroyed.

Question 4

explain the relationship between ke and gpe

Answer 4

as gpe decreases ke increases and vice versa

Question 5

give the 4 ways energy can be transferred?

Answer 5

force, electrically, waves, heating

Question 6

how can friction be reduced?

Answer 6

lubricants, air cushion, smooth surface, reduced area of contact, streamlining

Question 7

what is specific heat capacity?

Answer 7

the amount of energy needed to raise the temp of 1kg of a substance 1 degree

Question 8

what does the thermal conductivity of a material tell you about its energy?

Answer 8

how quick energy is transmitted through it by thermal conduction

Question 9

in the thermal rods experiment, what properties of the rods must be kept the same?

Answer 9

the diameter, length and temperature difference between its ends.

Question 10

what does the speed at how fast the wax melts tell us about the thermal conductivity?

Answer 10

it is higher depending on how fast it is.

Question 11

what are factors affecting the rate of heat loss in a building?

Answer 11

thickness of walls and roof
thermal conductivity of walls and roof

Question 12

how do you reduce thermal conductivity?

Answer 12

using thermal insulators

Question 13

put these stages of a nuclear power station in order
transformer
turbine
generator
nuclear reactor and boiler

Answer 13

nuclear reactor and boiler
turbine
generator
transformer

Question 14

what are the 4 non renewable energy sources?

Answer 14

coal, oil, natural gas, nuclear fission

Question 15

what are advantages of coal oil and gas

Answer 15

reliable, cheap

Question 16

what are the advantages of nuclear fission

Answer 16

no pollution, reliable, large amount of energy for small amount of fuel

Question 17

what are the disadvantages of coal oil and gas?

Answer 17

will run out
release co2
oil spills in ocean

Question 18

what are the disadvantages of nuclear fission

Answer 18

produces nuclear waste
expensive
will run out

Question 19

give the 7 renewable energy sources

Answer 19

solar
hydroelectric
tidal
wave
wind
geothermal
biofuels

Question 20

2 adv of solar energy

Answer 20

can be used in remote places
cheap to run once installed
no pollution

Question 21

2 disadv of solar energy

Answer 21

weather dependant
expensive to buy and install
cannot supply large scale demand

Question 22

2 adv hydroelectric

Answer 22

low running cost
no fuel cost
reliable and can meet demand

Question 23

2 disadv hydroelectric

Answer 23

expensive to build dams
Destroys habitats through flooding
releases GHGS

Question 24

2 adv tidal

Answer 24

predictable
can produce lots of electricity
no fuel costs
no GHGS

Question 25

2 disadv tidal

Answer 25

expensive to build and maintain change habitats dangerous for boats cannot control supply supply can vary

Question 26

2 adv wave

Answer 26

low running cost no fuel cost no GHGs

Question 27

2 disadv wave

Answer 27

change habitats dangerous to boats expensive to build, install and maintain weather dependant cannot supply large scale demand

Question 28

2 adv wind

Answer 28

low running cost no fuel cost no GHGs produced

Question 29

2 disadv wind

Answer 29

weather dependant large amount of land needed to generate large scale electricity noise pollution

Question 30

2 adv geothermal

Answer 30

low running cost no fuel costs no GHGs produced

Question 31

2 disadv geothermal

Answer 31

expensive only possible in a few locations worldwide

Question 32

2 adv biofuels

Answer 32

carbon neutral reliable

Question 33

2 disadv biofuels

Answer 33

expensive to produce requires lots of land and water can lead to deforestation