A complete circuit is often referred to as which type of circuit?

• A. Closed
• B. Open
• C. Short
• D. Infinite

Answer: (A)

A closed circuit occurs when the electrical path forms a complete loop from the power source, through the conductors and any loads, and back to the source. In this setup, electrons have a continuous path to follow, so current can flow and energy is delivered to the load. If the loop is broken anywhere—such as a switch opened or a wire disconnected—the path is no longer complete, and current cannot flow, which is why we call that an open circuit. A short circuit, on the other hand, is a fault where a low-resistance path bypasses the intended load, causing high current but not a normal, complete circuit for the designed devices. The term “infinite” isn’t used to describe a circuit type in this context.