anythin! Flashcards
work done
another way of saying energy transferred
system
fancy word for single objects or a group of objects you are interested in.
closed system
neither matter nor energy can enter or leave .total energy is always zero
energy can be transferred in which ways?
mechanically,electrically,heating and radiation
conservation of energy principle
energy can be transferred usefully,stored or dissipated,but can never be created or destroyed.
density
mass/volume
what is needed to melt a solid or boil a liquid?
increase in energy
the energy needed to change the state of 1kg of substance from solid to liquid at its melting point is known as….
specific latent heat of fusion lf
equation of specific latent heat
change in energy = mass *specific latent heat
energy transferred =
temperature change *mass *capacity
does an ammeter or volmeter measure current?
ammeter
does an ammeter or volmeter measure potential difference
voltmeter
does voltmeter go in series or parallel?
parallel
power(w)=
potential difference(v)*curent(a)
current
charge / time taken
potential difference =
current * resistance
what is temperature a measure of?
average kinetic energy
energy lost from gpe store=
energy gained in kinetic store
what is specific heat capacity
the amount of energy needed to raise the temperature of 1kg of a substance by 1c
power is..
rate of energy transfer or doing work
conduction
process by which vibrating particles transfer energy to neighbouting particles
thermal insulation
a material providing high restance to heat flow.
lubricant
used to reduce the friction between the objects surfaces when they move
efficiency
transfer energy from one energy store to a more useful one.
equation of efficiency =
useful output energy transfer / total input energy transfer
how can you improve efficiency
by insulating objects
non renewable energy resources examples
coal,oil,natural gas and nuclear fuels(uranium and plutonium)
renewable energy resource examples
wind,water waves,tides,hydroelectricity,the sun(solar), geothermal and bio fuel
renewable energy resource examples
wind,water waves,tides,hydroelectricity,the sun(solar), geothermal and bio fuel
