Physics 2.13 - 2.15

Question 1

How and what is geothermal energy generated

Answer 1

Geothermal energy is thermal energy that is generated and stored in the earth’s crust due to the radioactive decay from materials such as uranium and from the earths formation

Question 2

What can geothermal energy be used for (2 answers)

Answer 2

Heating homes
Source of electricity

Question 3

Is geothermal energy renewable (yes or no)

Answer 3

Yes

Question 4

What are biofuels

Answer 4

Biofuels are source of energy from recently living organisms

Question 5

Name 3 pros for bio fuels

Answer 5

Cheap, easy to transport, carbon neutral

Question 6

Name 1 con for bio fuels

Answer 6

In order to farm these bio fuels, some trees may need to be cut down in order to make space for the plants to grow which we would then later turn to bio fuels. The process of terraforming the land may lead to Co2 emissions

Question 7

How do hydroelectric dams work

Answer 7

Hydroelectric dams work by trapping a large amount of water on one side of the dam from rain or another source of water forming a reservoir. This reservoir has a large amount of gravitational potential energy which we can transform into electrical energy through the turbines on the dam which work the generators on the inside

Question 8

How do tidal barrages work

Answer 8

Tidal barrages work by trapping the high tides of water on one side so that when the water levels reduce, there is some sort of reservoir that has a large amount of gravitational potential energy which can be transformed into electrical energy through the turbines on the tidal barrage. This in turn works the generators on the inside forming electrical energy

Question 9

Name 3 pros about hydroelectric dams and tidal barrages

Answer 9

High power output and no pollution
Can run in times of high demand
Have low running costs

Question 10

Name 3 cons about hydroelectric dams and tidal barrages

Answer 10

Have a high upfront cost
Have an environmental impact on habitats
Often stop fish migration