Why must an electric circuit maintain a closed loop for current to flow?

• A. Because only closed loops can store electrical energy.
• B. Because a closed loop allows charges to continuously move through the circuit, enabling a sustained electric current.
• C. Because a closed loop prevents energy loss in the circuit.
• D. Because an open circuit increases the voltage across the power source.

Answer: (B)

Verified step by step guidance

1. Understand that electric current is the flow of electric charges, typically electrons, through a conductor.
2. Recognize that for charges to flow continuously, there must be a complete path or loop that allows them to move from the power source, through the circuit components, and back to the power source.
3. Note that if the circuit is open (i.e., the loop is broken), the path is incomplete, so charges cannot flow beyond the break, stopping the current.
4. Realize that a closed loop provides a continuous path for charges, enabling a sustained flow of current and allowing electrical energy to be transferred through the circuit.
5. Conclude that the necessity of a closed loop is fundamental because without it, the electric charges have no way to return to the source, and thus no current can be maintained.