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Paper 1
Energy
Efficiency
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Conservation and dissipation of energy
GCSE > Physics > Paper 1 > Energy > Efficiency
14 cards
Cards (39)
What happens to the energy that is not usefully transferred by the solar cells?
Wasted
Suggest one advantage of the aircraft having fuel cells as well as the solar cells.
can
fly
at
night
Give one environmental advantage of using electric motors to drive the aircraft propellers rather than motors that burn a fuel.
no greenhouse gases
solar cells transfer light energy to .......................................................energy.
electrical
batteries transfer ............................................................. energy to electrical energy.
chemical
The LEDs transfer electrical energy to ............................................................. energy.
light
Turbine turns a
coil in a…
Generator
Give one disadvantage of using a wind generator to charge a battery.
wind speed
may be
too low
to operate the
generator
State one factor, other than efficiency, that is important when considering the choice of a bulb for lighting in the home.
availability of bulbs
How does the design of the stove help to improve the rate of energy transfer by infrared radiation?
black
is a good emitter of
infrared radiation
large surface area
Give two environmental advantages of using a
wood burning stove
to
heat
a
home
rather than
heaters
that use
electricity
generated from
fossil fuels.
wood is
renewable
wood is carbon
neutral
What
is
meant by an energy source being renewable?
replaced faster than it
is
used
Name two other renewable energy sources used to generate electricity.
wind
waves
The step-up transformer increases the efficiency of the National Grid. Explain how.
decreases
the
current
reducing
energy loss
Suggest why it was important to confirm the efficiency independently
to
avoid bias
Outline some of the advantages of using solar cells to generate this electricity.
conserves fossil fuel stocks
can be used in remote areas
To make energy transfers more
efficient
, we have to
maximise
the
useful
energy and
minimise
the
wasted
energy from a
transfer.
Equations
in terms of
energy
Energy is measured in
joules
,
J
Efficiency
has
no units
Equation in terms of
power
Power
is measured in
watts
,
W
Ways to increase efficiency
thermal insulation
lubrication
streamlining
100%
efficiency is usually
impossible.
There is usually always some wasted
heat
energy in the form of
heat
/
thermal
energy.
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