P8.2 - Powering Earth

Question 1

Name renewable energy sources ?

Answer 1

• Solar energy
• Wind energy
• Bioenergy
• Biomass
• Wave energy
• Geothermal
• Tidal

Question 2

Name non-renewable energy sources ?

Answer 2

• Coal
• Oil
• Nuclear
• Fossil fuels

Question 3

Define renewable energy ?

Answer 3

Resources being used at the same rate as they can be replaced, not finite

Question 4

Define non-renewable energy ?

Answer 4

• Resources being used at the faster rate than they can be replaced, finite

Question 5

What are the differences between renewable and non-renewable energy?

Answer 5

• Renewable energy can be produced and supplied at the rate it is being used and hence will not run out. However, non renewable sources of energy will eventually run out as they take a very long time to form and cannot be supplied at the rate they are being used up in.
• Renewable energy sources such as solar and geothermal generate greenhouse gases do not generate greenhouse gases nor nuclear radiation.
• Therefore, renewable energy sources don’t give rise to environmental problems such as global warming.
• However, unlike non-renewable sources of energy, renewable sources of energy such as solar and wind, are unreliable.

Question 6

Why can’t a transformer work with direct current?

Answer 6

If there is a direct current the magnetic field will be constant and won’t push electrons backwards and forwards