Velleman EDU02 Manuel d'utilisateur télécharger pdf (Page 9)

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Required parts: Solar cell, 100 ohm resistor (brown black brown gold), yellow led

100

LD1

or an ge

SOLAR CELL

How it works: A closed circuit is

required to make the current flow.

Current flows from the (+) of the

solar cell trough resistor to the (+)

of the led and via the (-) of the led

back to the solar cell. On a sunny

day, the solar cell will generate 3..4

volts. The led only requires 2 volts

to operate. Resistor R1 converts

the excess voltage into (a little)

heat, hereby protecting the led from

damage.

Time to experiment:

What happens when you swap (+) and (-) of the led?

What happens when you replace the 100 ohm resistor with

a 47000 ohm resistor (yellow purple orange gold) ?

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Velleman EDU02 Manuel d'utilisateur Page 9