Are you a class 12 student looking for high quality Physics Investigatory Projects for your CBSE/ICSE assessments? Do you want to achieve high grades in your physics investigatory project, gain technical skills in electronics and develop a genuine interest in physics and engineering? Now you can with CoolJunk’s new and amazingly easy to use, innovative DIY (do-it-yourself) kit for electronics and electrical projects that are fully compliant with the CBSE/ICSE physics project curriculum requirements. Visit our website: http://www.cooljunk.in/physics-project-kits Using CoolJunk KIT-1 students can set up their personal lab at home, learn hands on electronics and can perform fun-to-do experiments sitting at home. For more information, visit our website: http://www.cooljunk.in

1. Part of Made in India,
Design Innovation
Workshop,2015
A
Fresh
New
Experience
in
Project-­‐Making
&
Learning!

2. PHYSICSINVESTIGATORY
PROJECTON
LDRASVARIABLERESISTOR

3. Have
you
seen
the
Volkswagen’s
talking
newspaper
ad?
An
LDR
(light
dependant
resistor)
was
embedded
in
the
newspaper
such
that
the
moment
a
person
opened
the
newspaper,
light
fell
on
the
LDR
and
the
audio
circuit
became
acMve,
producing
a
pre-­‐recorded
sound.
In
this
project,
you
will
need
a
breadboard,
an
LED,
a
resistor,
an
LDR,
a
mulMmeter
and
a
few
connecMng
wires.
A
mulMmeter
is
connected
in
series
with
the
circuit.
When
the
light
is
switched
off,
the
current
in
the
circuit
and
the
resistance
across
the
LDR
were
measured
through
the
mulMmeter.
The
value
of
current
was
also
calculated
theoreMcally
using
Ohm’s
law
and
KVL
(Kirchhoff’s
Voltage
Law).
Both
values
were
found
to
be
approximately
the
same.
Then
the
same
circuit
was
observed
in
light,
and
likewise
the
current
and
resistance
were
measured.
In
this
case
also,
both
the
theoreMcal
and
mulMmeter
values
of
current
were
found
to
be
approximately
the
same.
However,
it
was
observed
that
the
resistance
offered
by
the
LDR
in
the
dark
was
much
higher
than
its
resistance
in
the
light
and
consequently
the
LED
glows
brighter
in
the
light
than
in
the
dark.
In
the
end,
the
mulMmeter
was
removed
and
the
LDR
and
resistor
were
connected
in
series.
It
was
observed
that
the
intensity
with
which
the
LED
glows
decreases
when
the
top
surface
of
LDR
was
covered
with
a
finger.
The
intensity
of
glow
increased
when
the
finger
is
removed.
Thus
the
LDR
acts
as
a
variable
resistor
whose
resistance
decreases
in
the
light
and
increases
in
the
dark.

4. Have
a
look
at
what
we
provide
in
our
Project
Kit!
CoolJunk
is
India's
fastest
growing
DIY
(do-­‐it-­‐yourself)
kits
company
focused
on
project-­‐based
learning
in
science,
engineering
and
technology.
Having
20,000
users
in
India,
US,
Singapore,
Middle
East
and
New
Zealand,
the
CoolJunk
kits
are
known
for
quality,
innovaMon
and
high
producMon
value.
CoolJunk
has
been
featured
in
naMonal
and
internaMonal
journals
including
Wallstreet,
Yourstory,
Hindu
Business
Line,
NextBigWhat
and
was
tagged
as
the
coolest
Indian
start-­‐up
in
IAN
Bootcamp-­‐2011.
You
may
also
refer
to
the
video:
LDR
For
more
projects
visit
our
website:
CoolJunk
All
tools
and
components
in
one
box.
Step
by
step
visual
instrucMons
Detailed
experiment
theory
CoolJunkCoolJunkCoolJunk
Follow
us
on:
CoolJunk