1. A source of electrical potential energy: This could be a battery, a power plant, or any other source that can provide a difference in electrical potential between two points.

2. A closed circuit: This is a continuous path for the electrical current to flow. The circuit must be complete, with no breaks, for the current to flow.

3. A conductive material: This is a material that allows electrons to flow easily through it. Common conductors include metals like copper and silver.

Think of it like a water pipe system:

* Potential energy: The water tower creates a difference in pressure, just like the battery creates a difference in electrical potential.

* Closed circuit: The pipes provide a continuous path for the water to flow, just like wires provide a path for electrons.

* Conductive material: The water itself is the conductive material, allowing the flow of water.

Without all three of these elements, an electric current cannot flow.