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

2. PHYSICSINVESTIGATORY
PROJECTON
CHARGINGANDDISCHARGING
ACAPACITOR

3. Do
you
know
that
a
capacitor
is
so
ubiquitous
that
it
is
rare
that
an
electrical
or
electronic
product
does
not
include
at
least
one
for
some
purpose?
Besides
being
used
as
an
energy
storage
device,
it
is
used
in
filter
circuits,
tuning
circuits
(for
radio,
TV,
transmiMers
etc.)
and
also
as
shock
absorbers
in
voltage
stabilizers.
You
can
learn
about
the
funcRoning
of
a
capacitor
and
how
the
voltage
across
it
changes
when
it
gets
charged.
This
project
is
divided
into
two
phases.
In
the
first
phase,
a
resistor,
a
capacitor
and
an
LED
are
connected
in
series
on
the
breadboard.
The
mulRmeter
probes
are
connected
to
the
capacitor
for
a
constant
voltage
measurement
across
its
terminals,
before
supply
is
given
to
the
circuit.
Immediately
aTer
the
supply
is
given,
the
LED
starts
to
glow
with
maximum
intensity
and
the
meter
shows
an
instantaneous
voltage
reading
of
0
V.
The
meter
will
show
a
conRnuously
increasing
voltage
which
becomes
steady
aTer
someRme.
The
LED
slowly
fades
out.
The
iniRal,
transient
and
steady
voltages
were
observed
and
the
same
were
compared
with
theoreRcal
values
of
voltages
using
the
Rme
constant
(t
=RC)
calculaRons.
It
was
noted
that
the
voltage
across
the
capacitor
at
any
given
Rme
is
equal
to
the
sum
of
iniRal
voltage
and
63%
of
the
difference
between
the
baMery
voltage
and
the
iniRal
voltage
on
the
capacitor.
When
the
voltage-­‐
Rme
graph
of
a
charging
capacitor
was
ploMed,
it
showed
that
the
voltage
in
the
capacitor
increases
exponenRally
and
then
becomes
constant.

4. In
the
second
phase,
the
baMery
was
removed
and
the
same
charged
capacitor
was
connected
in
parallel
to
the
series
combinaRon
of
another
LED
and
a
resistor.
It
was
found
that
the
LED
glows
for
a
moment
with
a
maximum
voltage
across
the
capacitor.
Similarly
as
above,
the
voltages
on
the
capacitor
in
different
states
were
compared
with
the
theoreRcal
voltages
calculated
using
the
Rme
constant.
Note
that
in
this
case,
the
Rme
constant
is
the
Rme
the
capacitor
takes
to
discharge
37%
of
voltage
on
its
plates.
When
the
voltage-­‐Rme
graph
of
the
discharging
capacitor
was
ploMed,
it
showed
that
the
capacitor
loses
its
voltage
exponenRally
and
the
voltage
becomes
constant
aTer
some
Rme.

5. Have
a
look
at
what
we
provide
in
our
Project
Kit!
CoolJunk
is
India's
fastest
growing
DIY
(do-­‐it-­‐yourself)
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focused
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Having
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India,
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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:
Charging
&
Discharging
a
Capacitor
CreaAng
spark
using
a
Capacitor
For
more
projects
visit
our
website:
CoolJunk
All
tools
and
components
in
one
box.
Step
by
step
visual
instrucRons
Detailed
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theory
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