UNIT 15 L3 CONSERVATION OF ENERGY

Question 1

What are some advantages of renewables?

Answer 1

• sustainable
• requires less maintenance
• little to no waste, such as CO2 or other pollutants, is produced
• called clean energy
• can bring benefits such as employment

Question 2

What are some disadvantages of renewables?

Answer 2

• can be difficult to generate the large quantities of electricity needed
• relies on unreliable weather

-cannot be stored in large quantities for later use due to the impracticalities of having battery power plant backups

• Currently more expensive than traditional fossil fuels or nuclear energy.

Question 3

What are some costs of waste?

Answer 3

• Environmental
• Financial
• Lost revenue
• Storage Costs
• Disposal costs
• Lowered efficiency

Question 4

Why might a company choose to have their products made overseas?

Answer 4

• There’s greater flexibility and to focus on their core business
• To utilise larger manufacturing facilities abroad
• Economic savings due to lower labout costs
• Access to larger workforces

Question 5

What is the purpose of a Life Cycle Assessment (LCA)?

Answer 5

Conducting an LCA helps evaluate the potential environmental impact of a product

Question 6

Name a solar energy example

Answer 6

photovoltaic cells were developed to convert solar energy into electricity by French physicist Edmond Becquerel , they were used on the Vanguard satellite

Question 7

How does hydroelectric power (HEP) work?

Answer 7

Dammed or flowing water is fed or pumped down feed pipes that drive a water turbine and generator. Hydropower is seen as a flexible source of energy because it can quickly adjust output to match the demand

Question 8

How is Tidal barrages and wave power created?

Answer 8

Created by the motion of incoming and. outgoing ocean tides. This is a predictable source of power.

Question 9

What is Geothermal power?

Answer 9

Geothermal power stations harness the earth’s internal heat and pressure to generate energy. Hot water under the earth’s crust is extracted and used directly in heating systems to produce steam and drive turbines

Question 10

How does Biomass energy worK?

Answer 10

Organic matter such as wood, dried vegetation and crop residues are burned to heat water and produce steam. The steam turns the generator to produce power

Question 11

How many manufacturers implement energy efficient practices?

Answer 11

• Updating old, inefficient machinery
• Reducing product miles by siting production close to areas of demand and sourcing raw materials as locally as possible
• Reusing and repurposing waste materials generated in production

Question 12

What methods caan be considered to reduce waste?

Answer 12

• Scrafts, flashings and swarf may be recycled or repurposed
• Organic waste can be recovered and used for energy as biomass to power industrial plant or composted
• Recovering waste and grey water, treating it on site and reusing it in production