ENERGY
::
143
Heat energy
Thermocouple
This item can be used to illustrate the phenomenon of
thermoelectricity. It consists of a piece of copper wire
4865.00
stretched between two pieces of constantan wire. The
copper wire is wound and soldered securely to the con-
stantan wire. If a temperature difference exists between
the two junctions, an electrical potential (on the order of
millivolts) can be measured between the two pieces of
constantan wire. Supplied with 4 mm safety jack conne-
c tors and with a 10 mm diameter support rod.
4865.00 Thermocouple
Thermal
generator
The generator uses a Peltier element with 72 junctions
connected in series and
mounted on a cooling
pla tes. If a temperature
difference exists betw-
een the two sides of the
element, then a potential
difference will be genera-
4875.00
ted (Seebeck effect). On
the other hand, if a
potential is supplied to
the element, at tempera-
ture difference will appe-
ar between the two sides
(Peltier effect).
The exposed side of the
Peltier element can be
readily heated or cooled
e.g. using a metal conta-
iner with hot or cold
5015.00
water. An electrical cur-
rent can then be obser-
ved. The presence of this
current is easy to show
to a group using a small
lamp (e.g. 1.5 V, 0.09 A -
item no. 4250.05) or a
low torque motor no.
5015.00. If a voltage is
applied to the Peltier ele-
ment to produce a tem-
4875.00
perature difference, then
it must be no more than
8 V at 5 A.
4875.00 Thermal generator
®
Science Equipment for Education Physics
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