Unit 7 Energy reouces

Question 1

fuel

advantage and disadvantages

Answer 1

fuel = burnt to
make thermal
energy, makes
steam, turns
turbine

• Cheap
• Plentiful
• Low-tech

Harmful wastes:
o Greenhouse/
pollutant gas
o Radiation

Question 2

Wave energy:

Answer 2

=generators driven
by up and down
motion of waves
at sea.

• No greenhouse
gases produced

. Difficult to build

Question 3

Tidal energy

Answer 3

dam
built where river
meets sea, lake
fills when tides
comes in &
empties when
tide goes out;
water flow runs
generator
• No greenhouse
gases produced

• Expensive
• Can’t be built
everywhere

Question 4

Hydroelectric:

Answer 4

river & rain fill up
lake behind dam,
water released,
turns turbine 

• Low impact on
environment
• Energy produced
at constant rate

• Few areas of the
world suitable

Question 5

Geothermal:

Answer 5

water pumped
down to hot rocks
rising as steam

• No CO2
produced

• Deep drilling
difficult and
expensive

Question 6

Nuclear fission:

Answer 6

uranium atoms
split by shooting
neutrons at them
• Produces a lot of
energy with very
little resources

• Produces
radioactive waste

Question 7

Wind

Answer 7

Windmills
are moved by the
breeze. They
generate
electricity from
kinetic energy.

• NO CO2/
GREENHOUSE
GASSES
PRODUCED

• FEW AREAS OF
THE WORLD
SUITABLE.

Question 8

Solar cells/
photovoltaic
cells:

Answer 8

made of
materials that
deliver electrical
current when it
absorbs light
• No CO2
produced

• Variable amount
of sunshine in
some countries

Question 9

solar panels

Answer 9

absorbs energy

and use it to heat

Question 10

what are not the sources of energy

Answer 10

The sun is the source of energy for all our energy

resources except geothermal, nuclear and tidal

Question 11

nuclear fusion

Answer 11

n the sun, energy is created through a process called
nuclear fusion: hydrogen nuclei are pushed together to
form helium.