4.17 describe the advantages and disadvantages of methods of largescale electricity production from various renewable and nonrenewable resources.

Fossil fuels: non renewable; release CO2.

Burning wood: renewable; release CO2; destroy habitats.

Wind power: visual pollution; produces small amounts of electricity for space and effort in comparison to other methods.

HEP: expensive to set up; limited places to put it; can kill fish.

Solar cells: rely on the weather.

Nuclear power: dangerous; many waste products.

There are many more types of power and fors/againsts but these are a few important ones.

4.16 describe the energy transfers involved in generating electricity using several different methods

• wind- the kinetic energy from the wind, turns a turbine which turns a generator which produces electrical energy
• water- Kinetic energy from water, turns a turbine which turns a generator which produces electrical energy
• geothermal resources- Thermal energy heats water, water turns into steam, the thermal energy of the steam turns a turbine which then has kinetic energy, the turbine turns a generator which produces electrical energy
• solar heating systems- Light energy from the sun into thermal energy in water
• solar cells-convert light energy from the sun into electrical energy
• fossil fuels- Chemical energy is burnt to form heat energy, this turns into heat energy in water, this turns into kinetic energy in a turbine, this turns into electrical energy in a generator.
• nuclear power- kinetic energy in uranium, heat energy in water, kinetic energy in turbine, electrical energy in generator.