Cp3 renewable and non renewable energy

Question 1

What is the conservation of energy

Answer 1

the conservation of energy is a law that states energy can neither be created nor destroyed, only transferred

Question 2

what does renewable energy source mean

Answer 2

An energy resource that does not run out (unlimited), it will replenish itself. can be reffered to as clean energy

Question 3

What are some renewable energy resources

Answer 3

-Solar energy
-Wind energy
-Geothermal energy
-Hydropower
-Tidal energy
-Bio energy

Question 4

What does non-renewable energy resource mean

Answer 4

An energy source that is finite (it will eventually run out). they can sometimes damage the planet/environment

Question 5

What are some non renewable energy resources

Answer 5

-Fossil fuels
-Nuclear (however can be called clean due to the fact it produces zero carbon emissions and doesn’t produce other noxious greenhouse gases)

Question 6

what are fossil fuels

Answer 6

fossil fuels are a natural fuel such as coal, oil or gas, formed in the geological past from the remains of living organisms.

Question 7

What are fossil fuels mainly used for

Answer 7

Fossil fuels are manly used for transport, generating electricity and heating

Question 8

What are some advantages of fossil fuels, and some non rewnewable energy resources

Answer 8

-Reliable
-Release a lot of energy
-Adbundant and relatively cheap
-extremely versatile

Question 9

What are some disadvantages of non-renewable fossil fuels, and some non renewable energy resources

Answer 9

-Releases a huge amount of carbon dioxide (leads to global warming)
-Non-renewable, will run out
-Releases other pollutants, nitrogen oxide and acid rain

Question 10

What are some advantages of nuclear energy

Answer 10

Reliable
efficient
Abundant amount

Question 11

What are some disadvantages of nuclear energy

Answer 11

• high potential risk
• lots of time to dismantal station
• generates large amounts of radioactive waste

Question 12

What are some advantages of renewable energy resources

Answer 12

• no carbon/greenhouse gas emmisions (clean)
• ## sustainable (unlimited)

Question 13

What are some disadvantages of Renewable energy resources

Answer 13

-not fully reliable (not always windy/sunny)
-expensive
-tricky/expensive to dismantle

Question 14

what are some examples of examples of energy being moved between different stores

Answer 14

Toaster -> electrostatic into thermal
Sports (kicking a ball) -> chemical into kinetic
Heater -> Electrostatic into thermal

Question 15

What are some types of energy stores

Answer 15

-Thermal (heat energy)
-Kinetic (movement or motion)
-Gravitational potentional (position in a gravitational field)
-Elastic (Energy held in a strech like spring)
-Chemical (held in chemical bonds)
-Magnetic
-Electrostatic
-Nuclear

Question 16

How can energy be transferred

Answer 16

Mechanically
Electrically
Radiation

Question 17

what happens to wasted energy in energy transfers

Answer 17

the energy will eventually dissipate into the surroundings (ussually by heat)

Question 18

How do respresent energy transferred using diagrams

Answer 18

draw a sankey diagram

Question 19

Do you know how to draw/interpret a sankey diagram

Answer 19

Yes = good, carry on
No = watch this video - https://www.youtube.com/watch?v=dAOzDsluIX0

Question 20

define efficiency

Answer 20

Efficiency is the often measurable ability to avoid wasting materials, energy, efforts, and time while performing a task.

Question 21

How can efficiency be increased

Answer 21

efficiency be increased by reducing wasted energy transfers so more of the input energy is usefully transferred. new technology/machiner and finding an easier way to do the task will result in less wasted energy

Question 22

What is the formula for calculating efficiency

Answer 22

Efficiency = input/output x 100

Question 23

What is efficiency measured in

Answer 23

Percent / %

Question 24

What are some ways in which energy is transferred wastefully by mechanical processes

Answer 24

Mechanical process become wastefull when energy is dissapated (usually into heat or sound). the device won’t be exerting all of it’s possible energy on the task; making it less efficient.

Question 25

How can we reduce unwanted energy transfers in mechanical process

Answer 25

Improve efficiency

Question 26

What are the three ways energy can be transferred by heating

Answer 26

-Conduction
-Convection
-Radiation (infared)

Question 27

What is conduction

Answer 27

Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules.

Question 28

What is convection

Answer 28

convection, process by which heat is transferred by movement of a heated fluid such as air or water.

Question 29

What is radiation (infared)

Answer 29

Radiation heat transfer is a process where heat waves are emitted that may be absorbed, reflected, or transmitted through a colder body.

Question 30

describe ways of reducing unwanted energy transfers using thermal insulation

Answer 30

-Use materials with low heat conductivity
-Wall insulation
-Double glazing windows
-Create vacumm inbetween things like walls and windows (air is a good insulator) (double glazing windows and cavity walls are good examples)

Question 31

What is thermal conductivity

Answer 31

A measure of the ability of a material to transfer heat.

Question 32

What is Insulation

Answer 32

An objects ability to stop heat transfer

Question 33

what factors can affect gravitational potential energy

Answer 33

mass, gravity, and height

Question 34

What is the equation for finding gravitation potential energy

Answer 34

Gravitation Potential Energy = Mass x Gravitation field strength x Height

Question 35

What factors can affect the kinetic energy stored in an object

Answer 35

Mass and velocity

Question 36

What is the equation for kinetic energy

Answer 36

Kinetic energy = 1/2 x mass x (velocity)^2