The closed loop that allows electrons to move is called a circuit.

Here's a breakdown:

* Circuit: A complete path that allows electric current to flow.

* Electrons: Tiny, negatively charged particles that carry electric current.

Think of a circuit like a water pipe system:

* Water: Represents the electrons.

* Pipes: Represent the wires.

* Pump: Represents the power source (like a battery).

For water to flow continuously through the pipes, you need a closed loop (no leaks!). Similarly, for electrons to flow and create an electric current, you need a complete circuit.