GMAS 8th Grade Science Practice Test

If a circuit has a break that prevents current from flowing, this circuit is called what?

Closed circuit Short circuit Open circuit Series circuit

Correct Answer:

Open circuit

Explanation:

Current can flow only if there is a complete loop from the power source, through the conductors and components, and back to the source. If there’s a break in that path, the loop isn’t complete, so no current can travel. This situation is called an open circuit. That’s why devices in such a circuit stay off—the circuit isn’t closed for electrons to move. In contrast, a closed circuit has a complete path for current, a short circuit creates a low-resistance bypass that can cause too much current, and a series circuit describes how components are arranged in a single path, not whether the circuit is interrupted.

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