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

The reason: Basically, high power devices at the computer USB socket may

have a current consumption of 500 mA, low power devices one of up to 

100 mA. Unfortunately, not all USB sockets (depending on computer type) 

are short-circuit protected! Often, there is only one fuse soldered in at the 

socket, sometimes also the corresponding resistor. Some devices have a 

fuse that will reset on its own, in others it must be replaced after a short 

circuit. 
There are also mobile computer systems where the USB socket emits a 

reduced voltage and a reduced current.

The enclosed solar module comprises several polycrystalline solar cells. The 

silicon material, put together from several crystals, is contaminated by deliberate 

doping so that there will be a negative and a positive layer. 
At the top, the N-layer (negatively doped) is coated dark blue for better light 

absorption. The lower layer is the P-layer. 
Incoming light will put the electrons in motion and there will be a voltage between 

the two described layers. We can use this voltage and the flowing current. 
A single crystalline silicon solar cell will reach approx. 0.5 V per cell. The current 

depends on the cell size.