fuel for electicity

Question 1

where do we get biofuels from

Answer 1

methane- Cow farts, decaying rubbish

ethanol

Question 2

what does remewable mean

Answer 2

you produce it as fast as you use it

Question 3

what does carbon neutral means

Answer 3

it doesn’t add to carbon dioxide in atmosphere

eg, they may have planted some trees

Question 4

what is the fuel in a nuclear power station

Answer 4

uranium or plutonium

Question 5

how do you get energy from uranium

Answer 5

when nucleus of atom splits in two

nuclear fission

becomes very hot

Question 6

what is the coolant in a nuclear power station

Answer 6

liquid that is pumped through the core and transfers energy

Question 7

explain wind power

Answer 7

wind turbine is an electrical generator
on top of a tall tower

higher wind speed, more power generated

Question 8

how does wave power work

Answer 8

uses the waves to make a floating generator move up and down

this turns the generator to it generates electricity

Question 9

disadvantages with wave power

Answer 9

1. don’t produce a constant supply
2. lots of cables and building needed
3. tidal flow patterns might change

Question 10

how can we generate hydroelectric power

Answer 10

when rainwater in a reservoir flows downhill

turns an electrical generator

Question 11

how do tidal power stations work

Answer 11

traps water from each high tide behind a barrage then released high tide into sea through turbines

turbines drive generators in the barrage

Question 12

how much energy do solar cells convert

Answer 12

less than 10% of the energy that they absorb

Question 13

when are solar panels useful

Answer 13

1. when we need small amounts of electricity

2. in remote places

Question 14

what is bed about solar cells

Answer 14

1. expensive
2. need lots of them
3. need plenty of sunshine

Question 15

what does a solar heating panel do

Answer 15

heat water

Question 16

what’s a solar panel tower

Answer 16

tower surrounded by mirrors

that reflect sunlight into water tank, heating jt and turning generators

Question 17

where does geothermal energy come from

Answer 17

energy released by radioactive substances deep within the earth

Question 18

where are geothermal power stations built

Answer 18

volcanic areas

hot rocks below the surface

Question 19

how do power stations work

Answer 19

by burning fossil fuels and biomass

fuel> boiler> heat water to steam> turns turbine> turns generator> generates electricity

Question 20

where are burned in coal, oil and natural gas burned

Answer 20

fossil fuel power stations

Question 21

what is a biofuel

Answer 21

biofuel is a fuel obtained from living or recently living organisms that’s renewable and can be used to generate electricity

Question 22

what is a solar cell

Answer 22

flat solid cell that converts solar energy directly into energy

Question 23

how does geothermal energy work

Answer 23

water pumped down to hot rocks to produce steam and the steam drives electricity turbines that generate electricity

Question 24

how is ionising radiation harmful to living cells

Answer 24

ionising radiation can break molecules into ions.

Which can then take part in other chemical reactions in the living cells.

This may result in the living cells dying, or becoming cancerous.

Question 25

what are the two ways people can be exposed to radioactive hazards

Answer 25

irradiation

contamination

Question 26

explain damage by irradiation

Answer 26

The radiation from the material can damage the cells of the person directly.

This is damage by irradiation.

Question 27

explain damage by contamination

Answer 27

radioactive material can be swallowed or breathed in.

While inside the body, the radiation it emits can cause damage.

. This is damage by contamination.

Question 28

what’s worse for you contamination or irradiation

Answer 28

contamination causes more damage than irridation because radiation is in ur body for longer Time