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Nothing. An open circuit means no current is flowing. When the circuit is closed, current flows, the filament of the bulb is heated by the current and glows, giving off light. But when the circuit is open, nothing happens.

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7y ago
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16y ago

It goes out. That's what you do when you turn a switch off, you open the circuit. If it's shorted to ground, it will blow the fuse or trip the breaker.

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14y ago

In an open circuit the lights would be off. Closing the switch turns them on.

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10y ago

The current does not flow because there is no path to conduct it.

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7y ago

When a circuit is opened, electricity is no longer able to pass through it and there is no longer any electric power for the device.

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Q: When a circuit is opened what happens?
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