Question

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Wested cheat)
89 energy transferred by a fluorescent lama
in Sankey diagrams the width of the arrows shows the quantity of energy transferred. The
energy input is shown on the left. Useful energy transfers are shown by horizontal arrows,
Arrows pointing downwards represent wasted energy.
A car burns fuel with an energy value of 85 000 J. 68 000 J of this is output from the
engine as wasted heat energy and sound energy. Calculate how much useful energy is
left for moving the car.
2
Look at figure 8.9.
a) Write down the amount of energy that is useful.
b) Write down the total amount of energy that is input.
c) Explain what happens to the wasted energy
For the fluorescent light bulb shown in figure 8.9, calculate the percentage of the
input energy that is transferred usefully
An old-fashioned filament lamp wastes 95% of the energy supplied to it. Draw an
energy transfer (Sankey) diagram for it.
5
What percentage of the chemical fuel energy used by the car described in question 1
will eventually end up as thermal energy?
Activity 86: How energy makes things work​

Answer 1

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