When you turn on a battery-operated device, an electrical circuit is . opened closed

Closed

Explanation:

When the battery-operated device is of this means no current is flowing through the circuit. Since no current is flowing the device won't work. But since the battery is installed in the device and the current is not flowing this indicates that the circuit is not complete which is preventing the current from flowing in the circuit. We call this an open circuit, a circuit where there is a gap or a jump or no connection between two wires or parts of the circuit.

When the device is turned on by pressing the switch, it completes the circuit, the current starts flowing through it. We call this a closed circuit.

So, whenever a battery operated device is turned/switched on, it means the electrical circuit at that time is closed.

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explanation: