Energy Flashcards
what is the unit of power?
watts
how many watts in a kilowatt?
1000
in what two categories can we divide energy?
renewable
non-renewable
what was coal formed from?
coal was formed from dead trees and other plant material
how does burning fossil fuels produce electricity?
- used to boil water
- steam from water turns a turbine
- turbines turn generators
what is a fossil fuel?
natural, finite fuel formed from the remains of natural organisms
advantages and disadvantages of nuclear power
-does not produce carbon dioxide or sulphur dioxide
- non-renewable
- an accident could happen and radioactive material could be released
advantages and disadvantages of wind energy
+ renewable
- very noisy
- spoil the view
- no wind: no electricity
advantages and disadvantages of hydroelectric power
+ renewable
+ non-polluting
+can be easily switched on and off
- destroy habitats
- expensive af
- dams flood farmland
- the rotting vegetation underwater releases methane
advantages and disadvantages of solar power
+ non polluting
+ renewable
+ no fuel costs
- expensive
- relatively inefficent
- do not work at night
name six types of energy
kinetic energy light energy sound energy elastic potential chemical energy heat/thermal energy magnetic energy electrical energy internal energy gravitational potential
what does gravitational potential energy depend on?
- mass of the object
- height it gains
- gravitational field strength
how can you show an energy transfer in a lightbulb?
battery( chemical) —- transferred as electrical energy —– lamp —– transferred as light energy —- surroundings
what is conduction?
the transfer of heat through a material by transferring kinetic energy from one particle to another
how is energy lost in homes?
- radiation from the roof, walls and windows
- conduction through walls, roof
