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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
TOUCHACTIVATEDSWITCH

3. What
if
your
body
becomes
a
part
of
the
circuit
and
a
current
is
passed
through
it?
Well,
you
can
do
this
using
a
touch
acFvated
switch
circuit.
In
this
project,
you
will
need
a
breadboard,
an
LED,
a
transistor,
a
resistor
and
a
few
connecFng
wires.
The
connecFons
were
made
such
that
a
wire
was
connected
to
the
base
of
the
transistor
and
another
wire
was
connected
to
the
Vcc
(posiFve/high
voltage).
The
other
ends
of
both
the
wires
were
leP
open.
It
was
observed
that
when
the
two
connecFng
wires
were
pressed,
the
LED
glows.
The
harder
you
press
it,
the
more
will
be
the
intensity
with
which
the
LED
glows.
Now,
the
voltages
across
the
base-­‐emiQer
juncFon
and
the
collector-­‐emiQer
juncFon
were
measured
using
a
mulFmeter.
It
was
found
that
that
the
voltage
at
the
base
was
greater
than
the
voltage
at
the
collector
which
verified
that
the
transistor
was
in
the
saturaFon
state
and
acted
as
a
switch.
The
reason
why
the
LED
glows
is
because
our
body
acts
as
a
part
of
the
circuit
when
we
hold
the
wires.
It
offers
a
resistance
in
the
base-­‐emiQer
circuit,
the
value
of
which
may
vary
between
40,000
Ω
to
1,000,000
Ω.
When
the
wire
is
pressed
harder,
the
area
of
contact
with
the
connecFng
wires
will
increase.
Consequently,
the
effecFve
resistance
offered
by
our
body
decreases
and
the
current
increases.
This
makes
the
base-­‐emiQer
juncFon
forward
biased,
due
to
which
a
small
current
flows
through
the
transistor.
The
transistor
is
in
the
saturaFon
region
and
acts
as
a
switch.
As
a
result,
its
collector
and
emiQer
juncFon
is
approximately
equal
to
zero
volts.
A
collector
current
flows
in
the
collector-­‐emiQer
circuit.
The
current
gets
a
closed
path
and
the
LED
glows.

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,
innovaFon
and
high
producFon
value.
CoolJunk
has
been
featured
in
naFonal
and
internaFonal
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:
Touch
Ac?vated
Switch
For
more
projects
visit
our
website:
CoolJunk
All
tools
and
components
in
one
box.
Step
by
step
visual
instrucFons
Detailed
experiment
theory
CoolJunkCoolJunkCoolJunk
Follow
us
on:
CoolJunk