Must all devices in a series circuit be on or off at the same time?

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Multiple Choice

Must all devices in a series circuit be on or off at the same time?

In a series circuit there is only one path for current, so the same current must flow through every device in that path. Because the current is shared, the on/off state of each device is linked: if the circuit is closed and all devices are on, current flows through all of them and they’re all on. If any device is turned off (breaking the circuit), no current can reach the others, so they also go off. Therefore, all devices in a series circuit must be on or off at the same time. In contrast, in a parallel circuit devices can be on or off independently while still receiving current.

In a series circuit there is only one path for current, so the same current must flow through every device in that path. Because the current is shared, the on/off state of each device is linked: if the circuit is closed and all devices are on, current flows through all of them and they’re all on. If any device is turned off (breaking the circuit), no current can reach the others, so they also go off. Therefore, all devices in a series circuit must be on or off at the same time. In contrast, in a parallel circuit devices can be on or off independently while still receiving current.

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