national and global energy sources

Question 1

what is a renewable energy resource

Answer 1

an energy which can be replenished as it is being used up

Question 2

give 4 examples of renewable energy sources

Answer 2

windenergy
hydro-electricity
tidal energy
solar energy

Question 3

give an example of a non-renewable energy resource

Answer 3

.fossil fuels

Question 4

what are the advantages of generating power using gas rather than coal

Answer 4

. flexible generation-gas power stations have short start-up times so can be switched on and off more easily

.lower emmisions of carbon dioxide

Question 5

state two disadvantages of using renewable energy resources to generate power

Answer 5

. output often determined by external factors , so supply is uncertain

.generating power through others means its more efficient and economically beneficial

Question 6

explain the environmental impacts of burning fossil fuels

Answer 6

. carbon dioxide contributes to the greenhouse affect, and causes global warming

.sulphur dioxide leads to acid rain , which can damage buildings and crops

Question 7

state 3 advantages of fossil fuels as energy resource

Answer 7

.reliable- not dependent on external factors , so can generate power any time

.can produce large amounts of energy for a given quantity

.still relatively abundant, so cost-affective

Question 8

state 3 advantages of nucleur power-

Answer 8

.very large amounts of energy for relatively small quantities of fuel

.doesent release greenhouse gases,and so doesent contribute to climate change

.low fuel costs

Question 9

state 3 disadvantages of nucelur power

Answer 9

.produces nucelur waste which is harmful to humans , and must be stored safely for centuries

.non-renewable energy source

.risk of nucelur accidents , which can have fatal consequences on humans and, the environment

Question 10

how does hydroelectric power produce energy

Answer 10

. rainwater collects behind a dam
.when this water is released , it is used to turn a turbine
.this turbine, turns a generator which produces electricity

Question 11

what are some disadvantages of using biofuels

Answer 11

. when plants are burned or decay they release co2

.in order to grow biofuels , you need to destroy land , which leads to problems because
.the land could have natural habitats
.destroying land may involve burning plants growing on it , which can release co2

. Growing biofuels reduces the land available for growing food

Question 12

what are the advnatages of tidal energy sources

Answer 12

. they do not produce greenhouse gases
.they are quite reliable , as tides happen twice a day
.they are cheap to run as tides are natural,and so are free

Question 13

what are the disadvantages of hydroelectric power

Answer 13

.the dam may cause flooding
.it can cost a lot to install the required infrastructure

Question 14

what are some advantages of solar panels

Answer 14

.they dont cause harm to the environment

.they are renewable source

.they can be used in remote areas where other types of energy are less accesible

Question 15

give examples of social factors which may act as a detterent for certain types of energy production

Answer 15

.visual pollution
.sound pollution

. both of these are disadvantages of wind farms