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What is
efficiency
?
Useful
power
output
/
total power input
specific heat capacity
amount of
energy
needed
to
raise
temp
of
1kg
of
substance
by
1
degrees
types of energy stores
gravitation potential
,
thermal,
kinetic,
elastic
potential,
chemical,
magnetic,
electrostatic,
nuclear
ways in which
energy
can be
transferred
mechanically
(
work
done
by a
force
),
electrically
(
work
done
by moving
charges)
or by
heating
what is a
‘system’
Object
or a
group
of
objects
when
object
slows
down,
which
store
is
loosing
energy
kinetic energy store
energy
can be
created
but not
destroyed
false
-
conservation
of
energy
principle
states
energy
can
never
be
created
OR
destroyed
what does
energy
transferred
usefully
mean
transferred into the store
you want it to go to
equation for
power
+
work
done
power
=
work done
/time
what does a
‘powerful’
machine
mean
a
machine
that can
transfer
a lot of
energy
in a
short
space
of
time
should
thermal
insulation
have
high
or
low
thermal
conductivity
low
thermal
conductivity
what would an
efficiency
of
0
% tell you
device
doesn’t
transfer
any
energy
usefully
main fossil fuels
coal
,
oil
+
natural
gas
renewable energy resources
sun(solar),
wind,
water
waves,
hydro-electricity
,
biofuel,
tides
+ geothermal
material
that can be used to
make
biofuels
plant
products
or
animal
dung
energy
resource
that only
produces
power
during
daytime
solar power
what’s
tidal
energy
used
for
to
generate
electricity
is
wave
power
reliable
no,
waves
tend to
die
out
when the
wind
drops
why is
electricity
generated
by
mostly
non-renewable
energy
resources
generate electricity
fairly
cheaply
using
fossil fuels
+
supply
is
reliable
current
in
single
closed
loop
of
wire
is the
same
at any
point
true
equation that links
charge
flow,
current
+
time
charge flow
=
current x time
equation that links
potential
difference,
current
+
resistance
potential
=
current x resistance
diode
has a
very
high
resistance
in
one direction
true
relationship
between
pd
and
current
for
ohmic
conductor
at a
constant temp
Current
is
directly
proportional
to
potential difference
thermistors
can be used in
thermostats
that
control
the
temperature
of a
room
true
- used in lots of devices that need to
sense
temperature
change
all
components
in a
series
will have the same
size
current
flowing
through them
true
- current in series circuit is
same
at any point
how to find
total
resistance
of a
series
circuit
adding up
resistance
of each
component
in circuit
current through all
components
connected in
parallel
is always the
same
false -
current
shared between
branches,
pd
across
components
are the
same
Conservation of energy and power
Energy
can be
transferred
used,
stored
or
dissipated
but can never be
created
or
destroyed
power
rate
of doing
work
(
watts
)
power
power
(w) =
energy
transferred
(j) /
time
(s)
movement
energy
in an objects
kinetic
energy
store
what does
lubrication
do
reduces
friction
which can be
dissipated,
lubricants
are
liquids
=
flow
easily
between
objects
+ coat them
what can
heating
occur
by
convection
and
conduction
high
thermal
conductivity
energy
transferred
at a
faster
rate,
particles
move
faster
closed systems
neither
matter
nor
energy
can
enter
or
leave
boiling
water
in
kettle
Energy
transferred
to
water
by
heating
into
waters
thermal
energy
store
work done
energy
transferred,
work can be done when
current
flows
or by a
force
moving an
object
initial
force
exerted on a
person
ball
upwards
=
work done
transfer
from
chemical
store
of
arm
to
kinetic
store of
ball
and
arm
initial
force
exerted by a
person
ball
from
height
=
accelerated
by
gravity
gravitational
force
does
work
energy
transfer from
balls
gravitational
potential
store to
kinetic
store
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