physics flashcards

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how is energy transferred ?
conduction , convection and radiation
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where does conduction happen ?
in solids
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what is the relationship between dark matt surfaces and radiation?
they absorb radiation
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how do black surfaces help solar panels to warm water ?
the water pipes are under the black surface , the radiation from the sun is absorbed by the black surface which heats the water in the pipes.
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what does an object that is cooler than it's surroundings do ?
it absorbs more radiation that it admits
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why do metals conduct electricity so well?
they contain electrons which are free to move inside the metal. At the hot end the electrons move fatser and collide with other free electrons , this transfers energy to the surroundings
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what is the u-value ?
how quickly heat can transfer through a material
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what is payback time ?
initial cost divided by annual saving
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what does specific heat capacity do?
it tells you how much stuff something can store
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what do better insulators have ?
a lower u-value
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what is the conservation energy principle ?
Energy can be transferred usefully from one form to another , stored or dissipated but it can never be destroyed.
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when is energy only useful?
when it can be converted from one form to another.
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what are the 9 types of energy ?
Electrical energy , light energy , sound energy , kinetic energy, nuclear energy , thermal energy , gravitational potential energy and chemical energy.
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in a sankey diagram what does the thickness of the arrow represent ?
the thicker the arrow the more energy
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what are non renewable energy resources ?
sources of energy that will run out one day.
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what are renewable sources of energy ?
sources of energy that will never run out
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how do drive turbines work ?
the fossil fuel gets burnt to convert its chemical energy into heat. the heat is used to heat the waterand produce steam. the steam then turns a turbine converting heat energy into kinetic energy.
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what are transverse waves ?
waves with a perpendicular vibration to the direction of energy transfer of the power of the wave.
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what are longitudinal waves ?
waves that are paralell to the direction of energy transfer to the wave.
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Other cards in this set

Card 2

Front

where does conduction happen ?

Back

in solids

Card 3

Front

what is the relationship between dark matt surfaces and radiation?

Back

Preview of the front of card 3

Card 4

Front

how do black surfaces help solar panels to warm water ?

Back

Preview of the front of card 4

Card 5

Front

what does an object that is cooler than it's surroundings do ?

Back

Preview of the front of card 5
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