Diode, Battery holder – Velleman EDU02 User Manual
Page 6

6
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Diode
Diodes allow the current to flow in only one direction, from 
(+) to (–). Current flow in the opposite direction is blocked. 
(Velleman part# BAT85)
Battery holder
Holder for two AAA rechargeable batteries. Mind the polarity
(Velleman part# BH421A)
A special case: Zener diodes
Zener diodes allow the current to 
flow from (+) to (-), as regular diodes 
do. If you invert the polarity, they 
drop a certain voltage, which can be 
found on the body of the zener 
diode, e.g. 2V4= 2.4V 
(Velleman part# ZA2V4)
Re
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