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Detection of the presence of electric current in the wire

Posted: Fri May 29, 2020 4:40 am
by bumaks
A wire with electricity comes from the depths of the electrical network. I need to find out if there is electricity in this wire or not. I need to get the result as zero or one. How can i do this?
I tried to connect an electric wire to the logic elements, but it has no signal ....