energy resources Flashcards
How is coal energy from the sun?
Coal is from dead organisms. Plants use photosynthesis to gain energy and animals eat plants.
How is hydroelectric energy from the sun?
HE relies on the water cycle, which is driven by the sun (evaporating the water)
How is wind energy from the sun?
Wind is caused by the uneven heating of the atmosphere by the sun. Warm air above land expands and rises and heavier, cooler air rushes in to take its place, creating wind.
renewable energy
energy from a source that doesnt run out, so it can be replenished
suns energy is from
nuclear fusion
energy not from sun
geothermal, nuclear, tidal
why is non-renewable energy more prevalent than renewable energy?
Non-renewable sources tend to have a larger energy output per kg of fuel
efficiency
ratio of useful work done to energy
how can the efficiency of a system be increased
reducing waste output (by lubrication, thermal insulation, etc.)
recyling waste output (e.g. recyling thermal waste energy as input energy)
work done
work is done on an object when energy is transferred from one form to another
