energy (p1)

Question 1

what are the 8 energy stores

Answer 1

Kinetic, gravitational potential, elastic, thermal, chemical, nuclear, magnetic and electrostatic.

Question 2

What is the unit for energy?

Answer 2

joules , J

Question 3

What are the 4 energy transfers?

Answer 3

Mechanical, heating, radiation and electrical

Question 4

Thermal: Is this an example of a store or a transfer?

Answer 4

store

Question 5

Heating: Is this an example of a store or a transfer?

Answer 5

transfer

Question 6

Electrical: Is this an example of a store or a transfer?

Answer 6

transfer

Question 7

Electrostatic: Is this an example of a store or a transfer?

Answer 7

store

Question 8

What type of energy is stored in moving objects?

Answer 8

kinetic

Question 9

What type of energy is stored in objects that have been stretched or squashed?

Answer 9

elastic

Question 10

What type of energy is stored in objects that have been lifted above ground?

Answer 10

Gravitational potential energy (GPE)

Question 11

What type of energy is stored in batteries, food and drink?

Answer 11

chemical

Question 12

What is the equation for gravitational potential energy?

Answer 12

GPE = mass x height x gravitational field strength

Question 13

What is the equation for kinetic energy?

Answer 13

KE = 0.5 x mass x velocity²

Question 14

What is the correct unit for mass?

Answer 14

Kilograms, kg

Question 15

What is the correct unit for extension or height?

Answer 15

Metres, m

Question 16

What is the conservation of energy law?

Answer 16

Energy can’t be created or destroyed, only transferred

Question 17

What is a closed system?

Answer 17

A closed system is a collection of objects where neither energy nor matter can leave

Question 18

What are the equations for power?

Answer 18

Power = energy ÷ time
Power = work done ÷ time

Question 19

What is the definition of power?

Answer 19

Power is the rate of energy transfer or work done

Question 20

What is the unit for power?

Answer 20

watts , W

Question 21

What are the two ways to calculate efficiency?

Answer 21

1) Efficiency = useful energy output ÷ total energy input
2) Efficiency = useful power output ÷ total power input

Question 22

Can devices be 100 % efficient?

Answer 22

No. Energy is always wasted

Question 23

What is specific heat capacity?

Answer 23

The amount of energy required to raise the temperature of 1 kg of a substance by 1ºC.

Question 24

What are the main energy resources available for use on Earth?

Answer 24

Fossil fuels (coal, oil, natural gas); nuclear fuel; biofuel; wind; water (hydroelectric, waves, tides); solar; geothermal

Question 25

What is the definition for a renewable resource?

Answer 25

A resource that can be replenished as it is being used up

Question 26

What is the definition for a non-renewable resource?

Answer 26

A resource that is not replenished as it is used up

Question 27

Fossil fuels: Is this an example of a renewable or non-renewable resource?

Answer 27

non renewable

Question 27

Which energy resources are non-renewable?

Answer 27

Fossil fuels and nuclear fuels

Question 28

Nuclear: Is this an example of a renewable or non-renewable resource?

Answer 28

Non-renewable

Question 29

Hydroelectric power: Is this an example of a renewable or non-renewable resource?

Answer 29

renewable

Question 30

Solar: Is this an example of a renewable or non-renewable resource?

Answer 30

renewable

Question 31

Wind: Is this an example of a renewable or non-renewable resource?

Answer 31

renewable

Question 32

Geothermal: Is this an example of a renewable or non-renewable resource?

Answer 32

renewable

Question 33

Which energy resource generates the most power?

Answer 33

nuclear fuels

Question 34

Which energy resources are unreliable due to weather?

Answer 34

wind and solar

Question 35

Which non-renewable energy resource produces carbon dioxide?

Answer 35

fossil fuels

Question 36

What environmental issues are caused by fossil fuels?

Answer 36

Fossil fuels: produce CO₂ which causes global warming

Question 37

What environmental issues are caused by biofuels?

Answer 37

Biofuels: also produce CO₂ when burnt (but this can be off-set by planting more)

Question 38

What environmental issues are caused by hydroelectric power?

Answer 38

Hydroelectric: reservoirs require the flooding of large areas of land

Question 39

What environmental issues are caused by solar power?

Answer 39

Solar: large area of ground are covered (cannot be used for crops)

Question 40

What environmental issues are caused by wind and tidal power generators?

Answer 40

Wind, tidal: can affect the habitats they are in

Question 41

Is energy always conserved (in a closed system)?

Answer 41

yes