Paper 1

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  • Created by: leah else
  • Created on: 23-10-19 22:01
Define the word power
The rate which energy is transferred or the rate at which work is done
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What are the two ways to calculate power
-p=energy transferred/time -p=work done/time
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What does the payback time mean
Time taken for total savings of an energy saving divice to equal the amount of money it costs
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How do u calculate the payback time
cost of the insulator/amount of savings per year
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what are the the two ways to calculate efficiency?
useful output energy/total input energy - useful power output/total power input
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How can u increase the efficiency of an energy transfer?
-reducing the amount of unwanted energy transfers-transferring wasted energy usefully
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How do u calculate voltage
Voltage = current x resistance
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How do you calculate charge?
Charge = current x time
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how do u calculate the total cost?
number of units xcost per unit
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What are the three types of radiation?
Alpha,gamma,beeta
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which type of radiation causes the least amount of damage
gamma
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which type of radiation causes the most amount of damage
alpha
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what are the three wires called in a three pin plug?
live,earth and neutral
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What does the live and neutral wire do?
the live wire carries current to the appliance and the neutral wire carries current away from the appliance.
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What is force measured in?
newtons (N)
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What is the law of conservation of energy
energy can be transferred usefully,stored or dissipated
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What are the two ways to calculate the work done
forcex distance or power x time
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What is the secific heat capacity of an object
amount of energy required to raise the temp of 1 killogram of a substance by 1 degree
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What are the four ways energy is transferred?
mechanically,radiation,heating,electrically
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what are the 8 types of energy
thermaal,kinetic,gravatational,elastic,chemical,magnetic,electrostatic,nuclear
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How do u calculate the kinetic energy?
1/2 x mass x(velocity) squared
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how do you calculate the elastic potential energy
1/2 x spring constant x (extention) squared
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how do you calculate the gravatational potential energy?
mass xgravatational field strengh x height
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What is the gravatational field strengh on earth?
9.81 N/kg (sometimes rounded to 10)
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What happens to the energy store when an object is falling?
assumed that all the gravatational energy is transferred into kinetic
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How do u calculate the change in thermal energy?
mass x specific heat capacity x change in temp
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Wht is the units for kinetic energy?
J (Joules)
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What is the unit for mass ?
Kg
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What is the unit for velocity squared?
m/s
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What is the units for elastic potential energy?
J (joules)
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Are fossil fuels rennuable or non renuable?
Non renuable
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what are the advantages of fossil fuels
-cheap,easy,quick to produce electricity
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what are the dissadvantages of fossil fuels
-produces co2 which causes global warming,can not reuse,mining isnt very safe
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what are fossil fuels used for?
heating,generating electricity,transport
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Are nucleur fuels rennuable or non renuable?
non renuable
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Advantages of nucleur fuels
cheap,small amounts of wase,doesnt produce carbon dioxide
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dissAdvantages of nucleur fuels
dangerous,expensive to store,has to be under protection
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what are nucleur fuels used for ?
generating electricity,heating
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Are bio fuels reusable or non reusable?
renuable
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Advantages of bio fuels
cheap,less demand of fossil fuels,gets rid of waste
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Diss advantages of bio fuels
creates greenhouse gases,collecting the fuel is difficult
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What is bio fuel used for ?
generating electricity,transport,heating
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Advantages of wind energy
free,no greenhouse gases,land beneath can stil be used for farming
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dissadvantages of wind energy
wind is unreliable,paying for land is expensive,birds can be killed
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what is wind energy used for/
generating electricity
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What type of energy is Hydroelectricity?
renuable
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Advantages of Hydroelectricity
free,no pollution,,increases power very quickly
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Dissadvantages of Hydroelectricity
dams expensive to build,large dams flood large areas,
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what is Hydroelectricity used for ?
generating electricity
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What type of energy is geothermal?
renuable
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Advantages of geothermal
no fuel needed,power stations dont take up to much room,energy is almost free
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dissadvantages of geothermal energy
hard to find place to put it,dangerous gases are produced,steam may run out
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what is geothermal energy used for?
generating electricity,heating
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what type of energy is tidal and wave
renuable
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what type of energy is solar?
renuable
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Advantages of solar energy
doesnt cause polution,handy for low power divices
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dissadvantages of solar energy
doesnt work at night,expersive to build,unreliable unless u are in a sunny climate
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what is solar energy used for ?
generating electricity, heating
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what are the advantages of tidal and wave?
needs no fuel,once built it is free,not expensive to maintain
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dissadvantages of tidal and wave
can be a danger to wildlife,visual pollution
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what is tidal and wave energy used for?
generating electricity
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Other cards in this set

Card 2

Front

What are the two ways to calculate power

Back

-p=energy transferred/time -p=work done/time

Card 3

Front

What does the payback time mean

Back

Preview of the front of card 3

Card 4

Front

How do u calculate the payback time

Back

Preview of the front of card 4

Card 5

Front

what are the the two ways to calculate efficiency?

Back

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