Kemo Electronic B172 Manual De Instrucciones página 3

1
circuit with small lamp
The small lamp is connected to the battery, as indicated in
the illustration. Do not put both wires of the small lamp into
the same terminal of the lustre terminal! Each wire has to be
fitted into an individual terminal! The two bare wires of the
small lamp must not touch each other! If everything has been
done correctly, the lamp should light up. Instead of the lamp,
you may also connect the electric motor.
4
antenna
radiotransmitter system Marconi
Set up a simple circuit with motor and battery. In addition,
a short antenna wire of approximately 25 cm length is
connected. Whenever the running motor is placed directly
beside a radio, you will hear on long-wave or medium-wave
ranges in a distance of approx. 1 - 2 m to the motor a loud
crackling. It has to be adjusted so that no radio broadcasting
can be received. With a longer antenna wire (over 5 meters)
it is feasible to achieve greater ranges. In case the current
is briefly interrupted several times, it is possible to send a
Morse code into a room nearby. The transmitting signal is
produced by the break spark in the motor.
7
test of conductivity of water
Water may conduct current, if it is chemically polluted. Take
a glass of water and add 1 tablespoon of salt. If now both
bare wire ends are held into the water simultaneously, the
compass-ampere meter will indicate the flow of current. Also
the small lamp could glow, if the conductivity of the water is
very high.
General instructions:
For this construction kit you will also need a 4.5 V - flat battery,
a small screwdriver for the lustre terminals, one glass of water,
one tablespoon of salt. The connection to the battery is achieved
by removing the insulation of two cables about 3 cm at each end
and wrapping these bare wire ends firmly around the connecting
pins of the battery. The wire ends must necessarily be bare, do
not wrap the insulation of the cable around the connecting pins.
Otherwise there won't be electrical contact and the experiments
won't work! Furthermore, you must make sure that the battery
is charged!
The wire ends, which touch the screws in the lustre terminals,
need to have the insulation removed! Don't screw on the
insulation! Please do not tighten the screws too firmly, because
otherwise the cable may get damaged and could break off!
Each wire of the small lamp has to be fitted into an individual
terminal of the lustre terminal, make sure that the screw
3/8
GB
2
electromagnetism
Wrap the thin 50 cm long cable with approx. 30 turns around
the silver zinc nail and connect it short to the battery. The
current flow has the effect that the nail becomes magnetic
and will attract smaller iron parts like e.g. paper clips or
pins. The experiment should only be made for a short time
(max. 10 seconds), because otherwise the battery runs down
quickly due to the high power consumption.
5
Generator
When the motor axis is turned by hand, the motor produces
current. The compass with the coil is set up as in experiment 3
with freely swinging needle and the needle aligned along the
coil. Wiring is done according to the illustration. Depending
on the motor rotation, current is generated and the needle
turns to the left or right side. If the motor is equipped with a
wind wheel and achieves a very high speed, it could possibly
light up a small lamp.
8
longer wire
light emitting diode (led)
When connecting a light emitting diode make sure the
polarity is correct (the longer lead of the component connects
to the positive pole of the battery. If it is connected the other
way round, the LED will not light up.) In addition, normal light
emitting diodes require a resistor that reduces the current
consumption. The resistor has already been installed firmly
in the included light emitting diode. Compared to other
lamps LEDs distinguish themselves by a much longer life
span and a lower power consumption. The LED lights up if it
is connected according to the illustration.
fastens the wire firmly (in order to test that the wire is firmly
secured, pull carefully on the wire of the small lamp, the wire
should not be loose).
Safety instructions for B172
These operating instructions belong to this product. They contain
important instructions for operation and handling. Please keep
this in mind when passing the product on to another person.
Kemo componentries functioning with voltages below 42 V AC/DC
may be operated by children from 8 years of age and by persons
with restricted physical, sensory or mental abilities under survey.
Kemo componentries functioning with voltages over 42 V AC/
DC may be operated by adolescents from 16 years of age under
survey.
Never expose this kit to high temperatures or strong vibrations.
The commissioning must be carried out by suitably qualified
personnel to ensure that a safe operation of this product is
short connection
P / Bausätze / B172 / Beschreibung / 08032OM / KV003 / Einl. Ver. 002
3
current proof through a compass
First the enclosed coil is placed over the compass, so that
the needle aligns along the coil. There should not be any
iron parts, magnets or electrical devices nearby! Put some
cardboard or 2 pieces of wood under the compass, so that
it lies straight on the surface and the needle can turn freely!
If you connect the battery now, the lamp will light up and
the needle aligns crosswise to the coil! When the current
is turned off, the compass needle turns north again (along
the coil). The needle is magnetically attracted by the current-
carrying coil.
6
Selfmade battery
In order to build a weak, simple battery by yourself, fill a glass
with water and add 1 tablespoon of salt. The zinc nail and the
copper board have to be immersed into the water so that they
will not touch each other. If we now connect the compass-
ampere meter, the needle moves, indicating the existence of
current. The compass is set up as in experiment 3, so that
the needle will swing freely along the coil when no current
is flowing.
9
LED experiment
Because the light emitting diode already lights up at very low
currents (>3 mA), it is also possible to supply it with enough
current through the rotation of the motor. When turning
the included electric motor quickly with the fingers (with a
lot of momentum like a toy spinning top, so that the motor
axis rotates quickly), the LED briefly lights up (as long as
the motor is still rotating quickly). Important: Please try the
running direction in which you rotate the motor axis. The LED
lights up only in one of the running directions, because the
polarity must be correct!
guaranteed. The operating voltage may only be drawn from a
battery or power supply unit tested for safety.
The regulations for prevention of accidents for electrical
installations and operating material of the industrial employer's
liability insurance association are to be observed in industrial
facilities. In schools, training centers, clubs and do-it-yourself
workshops, the operation of this device is to be supervised
responsibly by trained personnel. Never place the device close to
combustible or inflammable materials (e.g. curtains).
we do not assume any liability for damage to property or
personal injury caused by non-compliance with the operating
instructions and these safety instructions as well as for its
consequential damage.