User manual

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current of a zinc carbon block battery, in contrast, is usually less than 1
A. This may already destroy sensitive components, but there is no
danger of burns.
The included battery clip has a connection cable with flexible strand.
The cable ends are stripped and tin-plated. This makes them stiff
enough to plug them into the contacts of the pinboard. However,
frequent plugging may cause them to lose their shape. Therefore, we
recommend that the battery connections stay connected at all times
and only the clip be removed from the battery.
1.3 Light-emitting diodes
The learning package contains four red LEDs. Always observe the
polarity of all light emitter diodes. The minus connection is called
cathode and is at the shorter connection wire. The plus connection is
the anode. Inside the LED, you can recognise a cup-shaped holder for
the LED crystal that is located at the cathode. The anode connection is
connected to a contact at the top of the crystal with an extremely thin
wire. Caution: In contrast to glow lamps, LEDs must never be directly
connected to a battery. A dropping resistor is needed in all cases.