Physics resources for IGCSE
or GCSE students.
Developed
by Conor Sheedy
[Science
home]
Revision sheets for IGCSE
or GCSE physics.
This series revision sheets are based on the IGCSE & GCSE
syllabuses.
Lots of formulas, definitions and key points to learn off.
There are also accompanying test sheets to check your
memorisation.
The idea is read the information
and than print the quiz sheet and try the questions.
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Revision
Exercise five:
Energy resources and energy transfer
Energy
transfer
forms of energy: thermal (heat),
light, electrical, sound, kinetic, chemical, nuclear and
potential (elastic and gravitational)
Conservation of energy : energy
is never created or destroyed, it changes from one form to
another.
Unit of energy: joule (J)
efficiency
=
useful energy output / total energy output
energy transfer may take place
by conduction, convection and radiation
convection currents cause sea
breazes,
insulation is used to reduce
energy transfers from buildings and the human body |
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Work and
power
work done = force ×
distance moved
W
= F × d
work done is equal to energy
transferred
gravitational potential
energy = mass × g × height
GPE = m × g ×
h
Edmund Becquerel
(Discovered solar energy)
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kinetic energy = ½ ×
mass × speed2
KE = ½ × m ×
v2
power is rate of transfer of
energy or the rate of doing work
power
=
work done / time taken
P
=
W/ t
Energy
resources and electricity generation
electricity generation uses:
renewable and non-renewable
resources
renewable
• wind
• water
• geothermal
resources
• solar heating
systems
• solar cells
non-renewable resources
• fossil fuels
• nuclear power
(but not in danger of running out)
Quiz for
revision exercise five:
Energy quiz
Further
information
About
ITS
"Not
only will atomic power be released, but someday we will
harness the rise and fall of the tides and imprison the rays
of the sun.
"
Thomas Edison
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