Renewable Energy Sources (10)

Question 1

Wind power involves putting lots of wind turbines up in _____________ places

Answer 1

Exposed

Question 2

Wind turbines convert the ___________ energy of moving air into ______________ energy

Answer 2

Kinetic

Electrical

Question 3

3 advantages of wind turbines

Answer 3

Cheap to run
Renewable
No pollution

Question 4

3 disadvantages of wind turbines

Answer 4

Expensive to set up
Ugly
Noisy
No wind = No output

Question 5

3 advantages of geothermal energy

Answer 5

Free
Renewable
No environmental problems

Question 6

2 disadvantages of geothermal energy

Answer 6

Only possible in certain places where hot rocks lie quite close to the surface
Drilling down several km is expensive

Question 7

How does geothermal energy work

Answer 7

Water is pumped in pipes down to hot rocks and forced back up due to pressure. This turns a turbine which drives a generator

Question 8

Energy transfers in geothermal energy

Answer 8

Heat to kinetic to electrical

Question 9

How does solar energy work

Answer 9

Solar cells (photocells) transform light energy from the Sun directly into electrical energy.

Question 10

3 advantages of solar energy

Answer 10

Renewable
Running costs are minute
No pollution

Question 11

2 disadvantages of solar energy

Answer 11

Not practical on a national gird
Too expensive to set up
Can be a problem if there isn’t a lot sun

Question 12

One way of harvesting wave power is with lots of small wave converters located around the ________

Answer 12

Coast

Question 13

Energy transfers in wave power

Answer 13

Kinetic to electrical

Question 14

3 advantages of wave power

Answer 14

Renewable
No pollution
Minimal running costs
No fuel costs

Question 15

3 disadvantages of wave power

Answer 15

Fairly unreliable (waves tend to die out when the wind drops)
Initial costs are high
Unlikely to provide energy on a large scale - only really useful on small islands

Question 16

Tidal barrages are big _______ built across river estuaries, with ___________ in them. As the tide comes in it fills up the estuary to a height of several _________. This water can be allowed out through ____________ at a controlled speed. It also drives the ____________ on the way

Answer 16

Dams
Turbines
Meters
Turbines
Turbines

Question 17

Energy transfers in tidal barrages

Answer 17

Kinetic energy to electrical energy

Question 18

3 advantages of tidal barrages

Answer 18

Renewable
No pollution
No fuel costs
Minimal running costs

Question 19

3 disadvantages of tidal barrages

Answer 19

Prevents boats from crossing
Spoils the view
Alters the habitat of wildlife
Height of the tide is variable so lower tides provide less energy than the higher ones
Initial costs are moderately high

Question 20

Hydroelectric power often requires the flooding of a ____________ by building a big _______. Rainwater is caught and allowed out through ___________, converting the GPE of the water to KE as it _________, which is then converted to electrical energy by the ______________

Answer 20

Valley
Dam
Turbines
Falls
Generator

Question 21

Energy transfers by hydroelectric power

Answer 21

GPE to KE to electrical

Question 22

3 advantages of hydroelectric power

Answer 22

Renewable
No pollution
Reliable unless there's a drought
Immediate response to increased demand
No fuel and low running costs

Question 23

2 disadvantages of hydroelectric power

Answer 23

Big impact on the environment due to flooding the valley
Loss of habitat for some species
Initial costs are high
Resevoirs can be ugly when dried up

Question 24

Most large power stations have huge ___________ which have to be kept running all night even though demand is very low. This means that there is a surplus of ______________ at night - and it’s surprisingly difficult to find a way of storing this spare energy for later use. One of the best solutions is __________ ___________

Answer 24

Boilers
Electricity
Pumped storage

Question 25

In pumped storage, ‘spare’ night-time electricity is used to pump water up to a __________ reservoir. This can be released quickly during periods of peak __________.

Answer 25

Higher

Demand

Question 26

Pumped storage uses the same idea as _______________ power however it isn’t a way of generating power - but simply a way of __________ energy which has already been generated

Answer 26

Hydroelectric

Storing