Flashcards
p1.3 & 4
Flashcards do conjunto (34)
- 1What can determine how much energy an appliance transfers over time?How long it was switched on
- 2Equation to calculate energyE = P X T
- 3Sources of non renewable energy examplesCoal
Oil
Natural Gas
Nuclear fuels - 4What are the 9 types of energy?Magnetic
Kinetic
Heat
Light
Gravitational
Chemical
Sound
Elastical
Electrical
Nuclear - 5Cost effectiveness and efficiency of Low energy Light BulbsLE bulb 4x more efficient than ordinary light bulb
Energy efficient bulbs are more expensive
E saving bulbs are more cost effective
LED bulbs are more efficient than low energy - 6Cost effectiveness and efficiency of replacing old with new- New appliances cheaper to run
- New appliances are more expensive to buy
- Work out if it's cost effective
- Work out its payback time - 7Sources of renewable energy sourcesWind
Waves
Tides
Hydroelectric
Solar
Geothermal
Food
Biofuels - 8Which fuel typed stations have the shortest start up time?fossil fuel and gas
- 9Advantages of Solar CellsNo pollution
Reliable in daytime
Used for small scale
Running cost almost 0 - 10Disadvantage of Solar CellsInitial cost is high
Used for small scale - 11Disadvantage of Hydro electricValley flooded to build dam
Destroys habitat
Releases CO2 and Methane in valley - 12Advantage of HydroEImmediate response
Running costs 0
Reliable
Useful for small scale - 13How does hydro electric system work?Continuous flow of water is released to power turbine to turn generator to produce electricity
- 14How does a Pumped Storage Dam work?Water released from upper reservoir to power turbine to power generator
Water is collected at lower reservoir and reused in upper reservoir
- 15Wave power systemWaves move up and down
When under barrier, air is forced up and turbine is turned - 16Tidal Barrier systemTide comes in at certain height and powers turbine and is released out the other side
- 17Disadvantage of using biofuelsWhen burnt CO2 released
Forest cleared to grow biofuels destroying habitats - 18Carbon CaptureWHen CO2 is captured and pumped into empty gas fields and oceans
- 19Disadvantage of nuclear stationsLong start up time
Produces waste - 20Advantage of nuclear stationsNo pollution
Longer operating life
Higher energy density - 21What does the National Grid do?Provides electrical energy to homes and industry
- 22Why should the voltage be increased in cables and the current kept low?Using high current means a lot of energy is lost through heat in cables
- 23Why are step up transformers used in the Grid?Step up transformers raise the voltage to make it travel more efficiently to homes and industry
- 24Why are step down transformers used in the National Grid?In order to bring the voltage down to more safe and usable levels
- 253 advantages of OVERHEAD cables- Low setup cost
- East to access
- Not much damage to environment - 263 disadvantage of OVERHEAD cables- Ugly
- Affected by weather
- Less reliable - 273 advantages of underground cables- low maintenance
- hidden
- not affected by weather - 283 disadvantage of underground cables- damages environment
- high set up cost
- hard to access - 29How can supply for more electricity be dealt with?More power stations can be built
Increasing power input - 30How can demand be reduced?Use more energy efficient appliances
- 31*Advantage of pumped storage systemSpare night time electricity is used to pump water back to the higher reservoir. This can be released during periods of peak demand .
- 32Which energy sources produce steam to turn a turbine?Fossil fuels
Uranium and plutonium
Biofuels - 33What is the problem with connecting small scale production to big like the National Grid?It is uneconomical
- 34What is the problem with using too much electricity?More fossil fuels are burnt which releases CO2 = global warming
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- GCSE Physics FlashCards sobre p1.3 & 4, criado por Dale George em 29-03-2016.
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- Dale George
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