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1. Simple Electrical Circuit:
Principal of the reed switch:
Place two iron parts in a sealed glass tube; the parts are very close to each other but are not touching each other. When the magnet is brought close
to the iron parts it magnetizes these so that they attract each other. The two iron parts contact each other and the electricity can flow through them.
When the magnet is taken away the two iron parts separate themselves from each other again.
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1. Lamp
Close the slide switch (15) and the lamp (18) lights up.
Open the slide switch (15) and the lamp (18) goes out.
2. Magnet-switched lamp
Replace the slide switch (15) with the reed switch (13). The lamp can
now only be controlled through a magnet. When the magnet comes
close to the reed switch (13) the lamp (18) lights up. Take the magnet
away from the reed switch (13) and the lamp (18) goes out.
3. Electric fan
Connect the parts as shown in the illustration. Ensure that the
slide switch (15) is set to „OFF". Turn it to „ON".
The direct current motor (24) starts.
4. Magnet-controlled fan
Replace the slide switch (15) with the reed switch (13). Bring the
magnet close to the switch (13). The motor (24) starts up.
Take the magnet away and the motor (24) stops.
5. Lamp and motor connected in series
Do not fix the yellow fan to the motor; Close the slide switch (15).
The lamp lights up and the motor (24) starts to rotate (sometimes the
axle must be lightly turned by hand ); open the slide switch (15),
the motor (24) stops and the lamp (18) goes out.
6. Lamp and motor connected in parallel
Build the experiment as shown in the illustration. Close the
slide switch (15). The fan rotates and the lamp lights up.
Open the slide switch (15), the fan stops and the lamp goes out.
7. LED (Light-emitting Diode)
Close the slide switch (15), the LED (17) lights up but the lamp (18)
doesn't. Because the LED (17) requires a lot less electricity than the
lamp (18) and in this series electrical circuit there flows very little in
electricity in total.
8. The LED interrupts the electricity
Close the slide switch (15). Neither the LED (17) nor the lamp (18)
light up, as the possible current direction in the electrical circuit and
in the LED (17) are opposed. This leads to no electricity flowing.
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© Arnulf Betzold GmbH
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