Electric Circuit:
An electric circuit is a complete path through which electric current can flow. It consists of various components such as a source of electricity, conductors, switches, and loads. The flow of electric current occurs due to the movement of electrons from the negative terminal of the power source to the positive terminal.

Closed Electric Circuit:
A closed electric circuit is a circuit in which there is a complete path for the electric current to flow. In other words, all the necessary components of the circuit are connected together in a loop, allowing the current to flow continuously. A closed circuit enables the uninterrupted flow of electrons and the functioning of electrical devices.

Characteristics of a Closed Electric Circuit:
1. Continuous Path: A closed electric circuit provides a continuous path for the flow of electric current. This means that the circuit is not broken or interrupted anywhere along the path.
2. Components Connected: All the necessary components of the circuit, including the power source, conductors, switches, and loads, are properly connected to form a closed loop.
3. Electrons Flow: In a closed circuit, electrons flow from the negative terminal of the power source, through the conductors and loads, and return to the positive terminal of the power source. This continuous flow of electrons constitutes the electric current.

Importance of Closed Electric Circuit:
A closed electric circuit is essential for the proper functioning of electrical devices and systems. Here are a few reasons why a closed circuit is important:
1. It allows the flow of electric current, which is necessary for the operation of electrical devices.
2. It ensures the completion of the electrical circuit, enabling the functioning of switches and loads.
3. It prevents any interruptions or breaks in the flow of electrons, ensuring the continuous operation of electrical systems.
4. It facilitates the efficient transfer of electrical energy from the power source to the loads.

Conclusion:
A complete electric circuit is called a closed electric circuit. It provides a continuous path for the flow of electric current and enables the proper functioning of electrical devices. Understanding the concept of closed circuits is crucial for learning about electricity and its applications.