Topic 1 Energy

Question 1

What is nuclear energy store?

Answer 1

The energy stored in the nucleus of an atom

Question 2

What is another word for thermal energy store?

Answer 2

Internal

Question 3

What are the 4 types of work done?

Answer 3

• mechanical work
• electrical work
• heating
• radiation

Question 4

What is mechanical work?

Answer 4

Energy transferred on an object by a force

Question 5

What is radiation?

Answer 5

Energy transferred as a wave

Question 6

What is work done?

Answer 6

When Energy is transferred

Question 7

What is the equation to calculate kinetic energy?

Answer 7

Kinetic energy = 0.5 x mass x (speed)(2)

Question 8

What are the units for spring constant?

Answer 8

Newton metres N/m

Question 9

What is the equation to calculate gravitational potential energy?

Answer 9

Mass x gravitational field strength x height

Question 10

What are the units for gravitational field strength?

Answer 10

Newtons per kilogram N/kg

Question 11

What are the units for the change in thermal energy?

Answer 11

Joules J

Question 12

What the units for specific heat capacity?

Answer 12

J/kg per degrees Celsius

Question 13

What is specific heat capacity?

Answer 13

Amount of energy required to raise 1kg of substance by 1 degree Celsius

Question 14

What is another term for energy transferred?

Answer 14

Work done

Question 15

What is the equation to calculate power?

Answer 15

Power = energy transferred/time or Power = work done/time

Question 16

The higher the thermal conductivity of a material …

Answer 16

The higher the rate of energy transfer by conduction across the material

Question 17

What are some ways of reducing thermal energy transfer from a building?

Answer 17

• use materials with low thermal conductivity:
• thick walls with a cavity filled with insulating material
• double glazed windows
• loft insulation

Question 18

What are 2 equations to calculate efficiency?

Answer 18

Efficiency = useful output energy transfer/total input energy transfer

Efficiency = useful power output/total power output

Question 19

What are the 3 main uses of energy?

Answer 19

• transport
• electricity generation
• heating

Question 20

What are the 3 main fossil fuels?

Answer 20

• coal
• oil
• gas

Question 21

What are the advantages of using fossil fuels as energy resources?

Answer 21

• cheap
• versatile
• reliable

Question 22

What are the disadvantages of using fossil fuels as energy resources?

Answer 22

• release CO2 - climate change
• non-renewable
• release pollutants

Question 23

Why type of energy resource is nuclear power?

Answer 23

Non-renewable

Question 24

What are the advantages of using nuclear power as an energy resource?

Answer 24

• doesn’t release CO2
• very reliable

Question 25

What are the disadvantages of using nuclear power as an energy resource?

Answer 25

• dangerous radioactive materials - disaster if released
• generates radioactive waste - has to be stored for thousands of years
• expensive

Question 26

What is a renewable energy resource?

Answer 26

An energy resource that can be replenished as it is used

Question 27

What are the 7 renewable energy resources?

Answer 27

• wind power
• solar power
• hydroelectric power
• tidal power
• biofuels
• geothermal
• wave power

Question 28

What are the advantages of using renewable energy resources?

Answer 28

• never run out
• don’t release CO2

Question 29

Which renewable energy resources are not reliable?

Answer 29

Wind and solar power

Question 30

What are biofuels produced from?

Answer 30

Plant materials

Question 31

What is power?

Answer 31

Rate of energy transfer

Question 32

What can be used to reduce friction between objects (unwanted energy transfer)?

Answer 32

Lubrication