energy Flashcards
what is an energy store
the different ways of which energy is stored in an object
what are the main types of energy stores
kinetic, magnetic, thermal, elastic potential, gravitational potential, chemical, nuclear
what is energy transfer
the process in which energy is moved from one store to another
what is the conservation of energy law
the fact that energy cannot be created nor destroyed
how can energy be transferred
mechanically, heating, electrically, radiation
what is a system
collection of matter/ objects
how does an open system effect energy transfer
- energy can be transferred with the outside world (any matter that is outside the system)
- open systems can loose or gain energy
how does a closed system effect energy transfer
- no matter or energy can enter or leave, energy is just transferred within the system
explain thermal energy and give the equation
energy due to heat
E = m × c × ΔT
Change in thermal energy = mass x specific heat capacity x change in temperature.
explain kinetic energy and give the equation
energy due to movement
Ek = 1/2 m v2.
half mass x velocity squared
explain gravitational potential and give the equation
Energy stored in an object due to its position in a gravitational field
Ep = mass x gravitational field x height
Ep = m x g x h
explain elastic potential energy and give the equation
energy stored in a stretched object
Ee = 1/2 x K x e squared
half spring constant x extension
what is power and give equation
rate of energy transferred
P = e/t
energy transferred divided by time
what is efficiency
how much of the energy transferred is useful energy in comparison to the energy wasted
what are the two types of energy recourses
non renewable and renewable
what are renewable energy recourses and give some examples
energy recourses that never run out, normally better for the environment
- wave power
- solar power
- hydroelectric
- tidal power
- wind power
- biofuel
what are non renewable energy recourses and give some examples
energy recourses that will eventually run out OR take a long time to renew
- gas, oil, coal - fossil fuels
- nuclear power
how do fossil fuels effect the environment
Burning fossil fuels results in the
emission of greenhouse gases which
contribute to global warming
explain why nuclear power can be dangerous
produce radioactive waste which must be
contained
what are the main uses of energy
- Transport
- Electricity
- Heating
what are the environmental impacts of energy resources
Extraction of Energy:
- Fossil fuels involve destroying landscapes
- Wind turbines can be considered an eyesore
Use of Energy Sources:
- Fossil fuels release harmful emissions
why is renewable energy not as reliable
- some conditions where renewable energy can’t work
for example: solar doesn’t work in bad weather or at night
wind energy if there is no wind
