energy+environment+national grid

Question 1

nuclear power advantages

Answer 1

1. no greenhouse gases

2. lots of energy per kilogram of uranium

Question 2

disadvantages of nuclear

Answer 2

1. contains radioactive waste- hard to dispose

2. if there was an explosion it would be a disaster

Question 3

advantages of renewable energy resources

Answer 3

1. don’t run out
2. not harmful to environment
3. don’t create radioactive waste
4. can be used for small things
5. running costs are normally low cause they don’t need fuel

Question 4

disadvantages of renewable energy

Answer 4

1. can create noise
2. need lots of land to generate electricity
3. can effect habitats

Question 5

problems with fossil fuels

Answer 5

1. produces carbon dioxide (global warming)
2. produces sulphur dioxide (acid rain)
3. non renewable - will run out

Question 6

what is the national grid

Answer 6

series of wires, cables and transformers that distributes electricity to our homes

Question 7

what do step up transformers do and where are they found

Answer 7

increase voltage lower current

used at power stations

Question 8

what do step down transformers do and where are they found

Answer 8

decrease voltage raise current

used in sub stations near homes

Question 9

why are there transformers

Answer 9

to less energy is wasted as heat through wires

to give homes the right amount of energy they need

Question 10

are renewable energy resources reliable

Answer 10

no the amount of electricity they generate depends on the conditions

Question 11

what power stations have a shortest to slowest start up time

Answer 11

natural gas

oil

coal

nuclear

Question 12

how is the variable demand for electricity met

Answer 12

1. use ing nuclear and coal and as constant supple
2. using gas to meet daily variations in demand
3. use renewable energy when demands are high and conditions are good
4. using renable energy resounded when energy is low to store energy

Question 13

why do the step up transformers increase the voltage

Answer 13

high grid voltage reduces energy loss and makes the system more efficient

Question 14

why do the step up transformers increase the voltage

Answer 14

high grid voltage reduces energy loss and makes the system more efficient

Question 15

advantages + disadvantages of tidal power

Answer 15

adv

doesn’t need the Steve
reliable
energy generated doesn’t rely on weather

disadv

initial set up costs are high
barrages expensive
energy generated depends on time of month and year

Question 16

advantages and disadvantages of wave power

Answer 16

adv

• suitable a for small scale use
  doesn’t need stems
  doesn’t depend on time of year and month

disadv

unreliable
expensive
amount of energy depends on weather

Question 17

what is meant by decommission

Answer 17

shutting down or removing from an active status