energy

Question 1

Name all 8 energy stores;

Answer 1

kinetic, elastic, gravitational potential, nuclear, thermal, chemical, magnetic and electrostatic

Question 2

give 3 disadvantages of fossil fuels

Answer 2

not renewable
inefficient
contributes to climate change

Question 3

how does the generator effect work?

Answer 3

rotating a metal turbine to produce electricity

Question 4

name 3 advantages of geothermal energy

Answer 4

reliable
renewable
does not pollute

Question 5

name 3 disadvantages of geothermal energy

Answer 5

location specific
can lead to land instability

Question 6

what is the differnce between an open and closed system?

Answer 6

open - can transfer energy or matter with the outside world
closed - cant

Question 7

what are the 2 types of work done?

Answer 7

mechanical - force on an object
electrical - the flow of charge into an object

Question 8

what 2 variables determine the strenght of gravity?

Answer 8

mass of the objects
distance between the objects

Question 9

define conduction

Answer 9

the transfer of energy through vibrating particles to their neighbours

Question 10

define thermal conductivity

Answer 10

how well objects transfer energy through conduction

Question 11

define convection

Answer 11

where particles with high energy replace the place of particles with low energy

Question 12

what is power the rate of?

Answer 12

energy transferred
or
the rate work is done

Question 13

name the 3 main fossil fuels

Answer 13

coal
crude oil
natural gas

Question 14

give 2 pros and cons of fossil fuels

Answer 14

relatively cheap
can be used in any conditions
but
they are a limited resource
they produce carbon dioxide when burnt

Question 15

give 2 pros and cons of nuclear energy

Answer 15

they do not produce pollutants
they can be used in any condition
but
they are non renewable
they produce radioactive waste

Question 16

how do wind turbines transger energy?

Answer 16

as wind turns them, a generator is turned. Transferring energy from their kinetic store into electrical energy in the generator.

Question 17

give 2 pros and cons of wind and solar energy

Answer 17

they have low running costs
dont produce pollutants
but
high upfront costs
weather dependant

Question 18

how do solar cells produce power?

Answer 18

converting sunlight directly into electrical energy

Question 19

what are 2 pros and cons of geothermal energy?

Answer 19

doesnt produce pollutants
renewable
but
only accessible in certain regions
power plants can be expensive

Question 20

what are biofuels?

Answer 20

fuels made from recently living organisms

Question 21

what are 2 pros and cons of biofuels?

Answer 21

burning them produces co2
growth requires space
but
renewable
cheap

Question 22

what are 2 pros and cons of tidal and hydroelectric power?

Answer 22

large amounts of energy with little pollution
low running costs
but
big impact on surrounding environment
stops transportation