Tip:
Highlight text to annotate it
X
Here's a cell phone
whose network reception is on maximum
now I'm going to put it in the aluminium foils here below
As you can see, the reception decreases progressively
until it reaches no network
This device is in fact an electrical shielding :
the aluminium foils which are excellent electrical conductors,
are forming a cage whithin which the electromagnetic waves emitted by the antenna can't be propagated.
In fact, by very low current in the aluminium, the whole device is equipotential
and the electrical fields which are supposed to convey information to the cell phone
can't be established
Finaly, the cell phone receives almost no information.
Then we say that it receives no network, as shown on the screen.
Now I'll remove the cell phone from the aluminium cage,
you can see that the network has picked up strongly.
THE END - Street Saint-Gilles RPZ