Please enable JavaScript.
Coggle requires JavaScript to display documents.
P1 pages 172- 173 (efficiency (useful output energy transfer/total input…
P1 pages 172- 173
efficiency
-
the less energy wasted in this energy store, the more efficient the device is said to be
useful devices are only useful because they can transfer energy from one store to another. some o the input energy is usually wasted by being transferred to a useless energy store - usually thermal
you can improve the efficiency of energy transfers by insulating objects, lubricating them or making them more streamlined
-
energy resources, both renewable and non renewable, are mostly used to generate electricity. the other two major uses are transport and heating
renewable
renewable energy resources are the sun(solar), wind, water waves, hydro electricity, biofuel, tides and geothermal
-
most of them do damage the environment, but in less nasty ways than non renewables
the trouble is they don't provide much energy and some of them are unreliable because they depend on the weather.
non renewable
-
three main fossil fuels are coal, oil and (natural) gas
-
-
-
-
-
for any given example you can talk about the types of energy being input and output but remember no device is 100% efficient and the wasted energy is usually transferred to useless thermal energy stores.
electric heaters are an exception to this. they are usually 100% efficient because all the energy in the electrostatic energy store is transferred to useful thermal energy stores
-