Engineers are able to compare fuels by unit to analyse efficiency when designing new cars.
Which of the rows below correctly match the units of specific energy and the energy density?
Specific Energy
Energy Density
A.
J
J
B.
Nm
kg m−3
C.
J kg−1
J m−3
D.
kg m2 s−2
J kg m−3
Choose your answer A B C D
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Sankey diagrams are used to represent energy transfers.
Which Sankey diagram shows the most efficient lightbulb?
Choose your answer A B C D
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The Sankey diagram for a new toaster is being analysed in a laboratory.
What is the correct amount of energy supplied to the bread as heat?
Choose your answer A B C D
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A scientist is investigating different primary energy sources.
Which row contains only primary energy sources?
A.
oil
petrol
gas
B.
waste
biofuels
biomass
C.
wave
solar
electricity
D.
wind
geothermal
hydroelectric
Choose your answer A B C D
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Fossil fuels are a non-renewable form of energy.
Which statement gives a correct description of how fossil fuels are used to produce electricity?
Burning fossil fuels provides thermal energy to a solar panel causing electrons to be excited and a current to be produced
Burning fossil fuels produces steam, which can turn turbines to generate electricity
Burning fossil fuels provides thermal energy to heat water under the earth, this water produces steam which turns a turbine to produce electricity
In instances of low wind speeds, burning fossil fuels can create steam and thermal energy to rotate big wind turbines
Choose your answer A B C D
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Energy resources can be described as renewable or non-renewable.
Which row gives a correct renewable and a correct non-renewable resource?
Renewable Resource
Non-Renewable Resource
A.
Solar energy
Wind energy
B.
Coal
Hydroelectricty
C.
Tidal Energy
Nuclear Fission
D.
Natural Gas
Diesel
Choose your answer A B C D
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What is the most common energy source used in central heating systems around the world?
Choose your answer A B C D
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Fuels can be compared per unit by analysing specific energy or energy density.
Which formula is correct for the density of a material?
density = specific energy × energy density
density = specific energy + energy density
Choose your answer A B C D
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Solar heating panels and photovoltaic cells can be used in countries where there is bright sunlight for large portions of the day.
Which row identifies the correct statements for the use of both solar heating panels and photovoltaic cells?
Solar Heating Panels
Photovoltaic Cells
A.
heat tap water
generate electricity
B.
cool drinking water
heat drinking water
C.
store water
store electricity
D.
generate electricity
heat tap water
Choose your answer A B C D
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Energy is consumed from different sources. A survey carried out in 2019 identifies the amount of energy consumed from: coal, oil, natural gas and renewables.
Which row identifies the sources of energy in order of most consumed to least consumed?
Most Consumed
Second-Most Consumed
Third-Most Consumed
Least Consumed
A.
Coal
Oil
Natural Gas
Renewables
B.
Renewables
Coal
Oil
Natural Gas
C.
Oil
Coal
Natural Gas
Renewables
D.
Natural Gas
Oil
Renewables
Coal
Choose your answer A B C D
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