Right-clicking a ME Transformer with a Fluix Wire Coil links the first end of the cable. Right-clicking a different ME Transformer or a ME Wire Connector will connect them. Note a Fluix Wire Coil can only stretch 24 blocks in length, but the ME Wire Connector can act as a relay to connect them.
Using the ME Transformer requires the consumption of 16 AE/t.
Engineer's Wire Cutters can be used to disconnect wires with a right-click.