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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
WHEATSTONEBRIDGE

3. Do
you
know
how
a
low
temperature
alarm
works?
A
thermistor
is
used
in
place
of
one
of
the
bridge
resistors.
The
resistance
of
the
thermistor
is
inversely
propor=onal
to
the
temperature
it
is
exposed
to.
This
means,
if
the
temperature
increases,
the
resistance
of
the
thermistor
decreases
and
vice
versa.
At
50
degrees,
the
resistance
of
the
thermistor
and
the
predetermined
resistances
of
the
three
fixed
resistors
are
at
values
that
make
the
bridge
balanced.
Suppose
the
temperature
drops
from
50
to
40
degrees,
the
poten=al
at
one
end
of
the
bridge
becomes
more
posi=ve
than
the
other
leading
to
a
voltage
difference
which
causes
an
alarm
to
ac=vate.
A
Wheatstone
bridge
is
a
simple
four
arm
arrangement
of
4
resistors
and
is
used
to
calculate
the
value
of
an
unknown
resistance.
Among
the
4
resistors
two
are
of
known
value
(P
and
Q),
one
is
a
variable
resistor
(G)
and
the
other
resistor
(R)
is
unknown.
The
variable
resistor
(in
this
case
a
preset
is
used)
is
adjusted
such
that
the
current
through
the
mul=meter
(A)
is
zero
and
consequently,
the
poten=al
difference
across
the
terminals
becomes
zero.
In
this
stage
the
bridge
is
said
to
be
balanced
such
that
the
ra=o
of
two
known
resistances
is
equal
to
the
ra=o
of
the
unknown
resistance
and
the
variable
resistance
i.e.,
P/Q
=
R/S.
The
theore=cal
and
prac=cal
values
of
resistances
were
compared
and
the
rela=ve
error
was
calculated.

4. Have
a
look
at
our
Project
Kit!
CoolJunk
is
India's
fastest
growing
DIY
(do-­‐it-­‐yourself)
kits
company
focused
on
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in
science,
engineering
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technology.
Having
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India,
US,
Singapore,
Middle
East
and
New
Zealand,
the
CoolJunk
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innovaUon
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CoolJunk
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including
Wallstreet,
Yourstory,
Hindu
Business
Line,
NextBigWhat
and
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the
coolest
Indian
start-­‐up
in
IAN
Bootcamp-­‐2011.
For
more
projects
visit
our
website:
CoolJunk
Tools
and
Components
in
one
box.
Step
by
step
visual
instrucUons
Detailed
experiment
theory
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us
on:
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