Energyrequired to overcomeresistance in wires of a circuit
Nuclear fuels
Non-renewable
Radioactive waste (needs to be disposed of safely)
Biofuels
Renewable
'Carbon neutral', so low impact
Wind
Renewable
Takes up large areas that could be used for farming
Some people say windmills spoil the view
Hydroelectricity
Renewable
Local habitats are affected by the large areas that need to be flooded to build dams
Geothermal
Renewable
Low impact
Tides
Renewable
Tidal barrages can block sewage which needs to go out to sea
Sun
Renewable
Low impact
Water waves
Renewable
Low impact
Charge is a property of a body which experiences a force in an electric field. Charge is measured in coulombs (C).
The potential difference (or voltage) of a supply is a measure of the energy given to the charge carriers in a circuit. Units = volts (V). This is the voltage between two points that makes an electric current flow between them.