paper 1 whole revision Flashcards
(27 cards)
what does geeks lunch stand for ( x u)
-gravitational potential energy
-electrical energy
-elastic potential energy
-kinetic energy
-sound energy
-light energy
-u x
-nuclear energy
-chemical energy
-heat ( thermal ) energy
what is the law of conservation energy?
-energy cannot be created or destroyed, only transformed into another type of energy
what is kinetic energy measured in ?
-joules
what is mass measured in?
-kg
what is velocity measured in?
-m/s
what is spring constant measured in?
-n / m
what is height measured in?
- meters
what is specific heat capacity measured in?
-J/kg°C
what is the unit for power?
-Watts
what is work done measured in?
-joules
what happens to wasted energy?
-it dissipates into the surroundings
how are houses energy-efficient?
-cavity wall insulation
-double glazing
-loft insulation
-carpets
-curtains
-draught excluders
generating electricity
renewable energy sources :
sun
wind
water - tidal
- hydroelectric power
- wave power
geothermal
finite resource :
fossil fuel - coal , oil , gas
nuclear power
what are the advantages and disadvantages of solar power?
-they do not release carbon dioxide
-we are not going to run out
-non- polluting
-it doesn’t happen at night and it isn’t good on cloudy days
-can be expensive to stall
what are disadvantages of tidal and wave power?
-can be disruptive to the local environment
what is a disadvantage of the hydroelectric dam?
-involves flooding a large area which may include people’s homes or animal habitats
what are advantages of using fossil fuels or nuclear power?
-readily available
-cheap source of electricity
what are the disadvantages of using coal, oil, or gas?
-they take millions and millions of years to create so we are about to run out of them
-heavily polluting so they release large amounts of carbon dioxide into the atmosphere which contribute to climate change
what is the disadvantage of nuclear power?
-you have to store their nuclear radioactive waste for long periods of time
-there is a potential risk of explosion
thermistor
-used in central heating
-only allows current to flow at certain temperatures
what are light dependent resistors used in?
-street lights
-security lights
what are two differences between a series circuit and a parallel circuit?
-in a series the current is same everywhere while in a parallel circuit the total current is sprit across branches
-in a series circuit the total potential difference is split across components
how does the step up transformer affect electricity?
-turns low voltage into high voltage to prevent energy loss , making it more efficient
what is the units for meters in the density equation?
-m³
