Fill a glass with a copper sulfate solution. Attach wires to a battery. On the positive wire, attach a copper strip or wire. On the negative wire, attach a metal object to be plated.
Coins work well.
Put the ends of both wires into the solution, and wait several minutes. When electrified, the solution contains positively charged copper particles, which are pulled to the negative terminal. When the particles hit the object, a thin coating of copper will be placed on it.