As you can see in our last publication which talks about “You, Me,
Electricity”, one area of NEMO museum, we only talked about one subject “cellular phone communication”.
So when we went to the museum we realized that in this area there wasn’t only
information about it, there, there were also information about radio,
compasses… and now we would like to explain you more about it:
Electrical revolution step 1 – 1820
Discover how electricity moves a compass needle without touching it.
When you flip the switch, electricity starts to flow through the wire. The
electricity turns on thre lamp and a magnetic field is created around the wire.
The needle, which usually points north, is now attracted by this stonger
magnetic field.
You can use this system to communicate if you agree a code beforehand but
the receiver can't response you.
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