Conrad Course material 10127 14 years and over 10127 Manual De Usuario

a)  

b)  
Fig. 003: a) Solar module with protective film, b) Circuit symbol 

A diode only permits current to flow in one direction. They are therefore used to 

rectify alternating voltages and block undesired polarity in direct voltage. The func-

tion of a diode can be imagined as a kind of check valve (as in water installations) 

in regular operation.