Copper Wires

One of the things copper is known for is it's ability to transport electricity through it's wires.

Copper wires would be made of 4 copper ingots and 2 redstone dust. You would get 3 wires from crafting it once.

Copper wires provide an endless redstone signal and can go up on walls and ceilings. It can also carry electricity through copper blocks, if there was a copper wire on the floor for example, and not on the wall, the wire would attach to whatever block is next to it on the wall. If the wall was lined up with copper blocks, then the signal from the wire can carry the signal through 5 copper blocks in any direction and can power anything in that range.

Copper blocks with the power from the wires become like redstone blocks, but can power anything next to it.

However, in order for the wires to have any power, they need to be connected to a redstone block or a copper block with power traveling through it.