TEACHER-STUDENT
WORKSHEETS
demountable
transformer
kit
Demountable Transformer Kit
o set
up the transformer
unit,
coils
are
placed,
1. To1.setTup
the transformer
unit, two coils
are two
placed,
one on
each
vertical side, on the core
one
on
each
vertical
side,
on
the
core
as
shown
in
as shown in the photograph/diagram below:–
the photograph/diagram below:–
2.
3.
4.
Method
1. T
o show how the transformer can step up or step
down voltages, different coils are used on either side.
2. The 1000 turn mains coil can only be used as the
input (primary) coil, any other set up would be
exceedingly dangerous.
3. Initially use the 1000 turn mains coil as the input and
the 500 turn coil as the output. Do not try to measure
the mains input voltage as it would be dangerous and
it will be at around 230V.
4. Using the voltmeter on a suitable scale measure the
output voltage, use well insulated wires as it should
be at 115V. This is a step down transformer.
5. Keeping the 500 turn coil in position, then replace
the 1000 turn coil with a 50 turn coil, connect it to an
2. The top part of the core is placed on the vertical
a.c. power pack set to 5V, the output voltage on the
arms and then clamped firmly onto the arms.
secondary coil should read about 50V as the turns
3. Ideally, two a.c. voltmeters are used, one connected
ratio is 10 so the output voltage should be 10 times
The topto
part
the corecoil
is placed
vertical
armsinput
and then
clamped firmly onto
theinput voltage.
theofoutput
and on
thethe
other
to the
coil.
the
arms.
6. Repeat the above procedure with different coils
4. Failing that, one voltmeter can be connected to the
on both sides of the core to prove the transformer
output coil if the input has been set to a fixed, known
formula.
Digital voltmeters
work
very well
small
Ideally,voltage.
two a.c. voltmeters
are used, one
connected
to thefor
output
coil and the other
to the
input coil.
class sizes. Bigger classes would benefit from using
larger demonstration meters.
Failing that, one voltmeter can be connected to the output coil if the input has been set
to aThe
fixed,
known voltage.formula
Digital voltmeters
work very
for small class sizes. Bigger
transformer
can be written
aswell
follows:—
classes
wouldout
benefit
from using
meters.
Voltage
= number
of larger
turnsdemonstration
on secondary
coil
Voltage in
number of turns on primary coil
Where the primary is the input coil and the secondary is
the output coil. This can be expressed as:—
Edu-Lab© 2012
Question
Can you list jobs your body needs the
Edu-Lab Ltd, Unit 1, Karoo Close, Bexwell Business Park, Bexwell, Norfolk, PE38 9GA, UK
voltage
= the
turns ratio
energy for?
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+44(0)1366
385ratio
777 Fax:
+44(0)1366
386 535 E: info@edulab.co.uk W: www.edulab.co.uk
EDULAB Bexwell Business Park, Bexwell, Norfolk, PE38 9GA Tel 01366 385 777 Email enquiries@edulab.com Web www.edulab.com