User manual
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19. Solar Night Light
Test setup: Solar module, plug board, orange LED, transistor T1 2N3904, diode D1
1N4001, resistor R1 100 kΩ, electrolytic capacitor 1,000 µF, alligator cables and
clamps, lithium or old mobile phone rechargeable battery
The following experiment charges an energy accumulator during the day. In
darkness, it will emit the energy again – in the experiment setup via the light-
emitting diode. The energy is emitted until the stored energy is used up. The expe-
riment can be performed with a rechargeable battery as well as with the electrolytic
capacitor (1,000 µF). The small capacitor accumulator has the benet of making
the functional principle easy to understand without long charging times.
Fig. 066: Test setup of the night light