10 forms
mechanical, chemical, nuclear, thermal, gravitational, electrical, elastic, sound, light, magnetic
tidal pros and cons
cheap to run, could cause local flooding
fossil fuel pro and con
valuable, not renewable
biomass pro and con
easy to use, occupies space
solar pro and con
renewable, cloudy (with a chance of meatballs)
wave pro and con
no pollution, noise turbines
geothermal pro and con
renewable, expensive
nuclear pro and con
big amounts of energy in a small amount of space, not renewable
wind pro and con
renewable, noisy turbines
what is energy efficiency?
how good a machine is at transforming energy (as little waste as possible)
how do we calculate energy efficiency
useful energy output divided by total energy input
whats the difference between chemical energy and nuclear energy?
chemical= energy stored in the bonds between atoms/molecules
nuclear= energy that is released when the nuclei of atoms separate (fission) or merge (fuse, fusion)
what is the law of the conservation of energy
energy cannot be created nor destroyed, but it can transform from one energy to another
what is energy waste?
''leftover'' energy you did not intend (did not want), most commonly being heat. example: heat from a lamp when you wanted light
2 reasons why we want our energy in the electric form
1. easy to transport 2. easy to store