22. The diagram shows what happens to each
100 joules of energy from crude oil when it
is used as petrol in a car.
100 J
of
energy
crude oil
F
80 J
of
Th
energy
in
petrol
().J of energy
wasted by
car engine
a) What are the missing values (i), (ii), (iii)? [3]
b) Calculate how efficient the car engine is
at transferring the energy from petrol
into useful movement.
[2]
c) Two students are discussing the diagram.
The first says that none of the energy
released from the crude oil is really lost.
The other says that all of the energy
released from the crude oil is really lost.
What do you think? Explain your answer
as fully as you can.
[4] (AQA)
power station
(0)
J of energy used
to refine oil and transport
petrol to filling station
(1)
of energy
used to
make car
move