Energy Resources (Phy) Flashcards
diff. energy stores and egs
elastic - STRETCHED elastic band
kinetic - moving car
chemical - batteries, petrol, food
thermal - hot drink
vibration (kinetic (+ gravitational)) - tuning fork
nuclear - radioactive aton, nuclear bomb, core of the sun
gravitational PE - ball on high shelf
electric - thunderstorm
magnetic - magnet
energy transfers
mechanical work - a force moving an object through a distance
electrical work - charges moving due to a potential difference
heating - due to temperature difference caused electrically or by chemical reaction
radiation - energy transferred as a wave, eg light and infrared - light radiation and infrared radiation are emitted from the sun
transfer diagram
sankey diagram
energy efficiency
x 100 for potential efficiency
home appliances (kettle, hair dryer, bulb, TV) energy transfers
fossil fuels overview
nuclear fuels overview (energy store, Renewableness, uses, Power output, impact on environment)
bio-fuel overview (energy store, Renewableness, uses, Power output, impact on environment)
wind overview (energy store, Renewableness, uses, Power output, impact on environment)
hydroelectricity overview (energy store, Renewableness, uses, Power output, impact on environment)
geothermal overview (energy store, Renewableness, uses, Power output, impact on environment)
tides overview (energy store, Renewableness, uses, Power output, impact on environment)
sun (as energy resource) overview (energy store, Renewableness, uses, Power output, impact on environment)
water waves overview (energy store, Renewableness, uses, Power output, impact on environment)
how does fossil fuels work
fossil fuels adv and disadv
nuclear adv and disadv
how do wind turbines work
how do tidal barrage systems work
remember sluice gates open when tide is high, close until it is low, then open again - this is repeated
how does hydroelectric work
bio fuel adv and disadv
wind power adv and disadv
water power adv and disadv
solar power adv and disadv
solar panels vs solar cells
Solar Panels
The panels are fitted on a roof. Infrared radiation from the Sun shines through the glass lid and heats the water in the pipes.
Solar cells
A solar cell is a circuit component that uses light from the Sun to generate electricity. Many calculators use solar cells, and many houses have panels on their roof. Space probes often use solar cells to generate the electricity they need.
how does nuclear power work
fuel = uranium (/plutonium)
uranium fuel is in sealed cans in the core of the reactor
the nucleus of a uranium atom is unstable and can be split in two - energy is transferred from nucleus when this happens
there are lots of uranium atoms in the core so it becomes very hot
the energy of the core is transferred by a fluid (the coolant) that is pumped through the core:
coolant’s very hot when leaving core - flows thru pipe to a heat exchanger, then back to reactor core
energy transferred is used to turn water into steam in the heat exchanger, this drives turbines that turn electricity generators
how are fossil fuels and biomass used
pump storage
why is national grid important
designed to be able to adjust its supply to fluctuating energy demands
