Logistics Wires output a redstone current when there is power flowing through the wire, if you open the Gui and click on the switch labeled "Redstone output."
Differences Between Each Wire Copper Wire:
0.03 Ohm Resistance/Power Loss Value 3 Electrocution Damage (Uninsulated only) 
360 Maximum Amperes Tin Wire:
0.04 Ohm Resistance/Power Loss Value 2 Electrocution Damage (Uninsulated only) 
60 Maximum Amperes Silver Wire:
0.02 Ohm Resistance/Power Loss Value 2 Electrocution Damage (Uninsulated only) 
600 Maximum Amperes HV Wire:
0.01 Ohm Resistance/Power Loss Value 8 Electrocution Damage (Uninsulated only) 
20 Maximum Amperes Superconductor:
0.00 Ohm Resistance/Power Loss Value 
5 Electrocution Damage (Uninsulated only) 
Infinite Maximum Amperes Crafting 
Tutorial 
Materials Transformers Upgrades Wires Items Machines Batteries