Lights are on in closed circuit. It means that is a current flowing when circuit is being closed.
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In a closed circuit, the lights will be on, assuming there is a power source connected to the circuit and the switch controlling the lights is turned on. This is because the closed circuit allows the flow of electricity from the power source to the lights, completing the circuit and causing the lights to illuminate.
The circuit breakers in a panelboard feed separate circuits. The lights that stay on are on a different circuit than the ones that go off. To fine the circuit that feeds the lights that stay on, go to the panelboard and turn off the breakers one by one until the lights go out. This is the circuit that feeds that circuit of lights. Remember that lights and receptacles can be on the same circuit together.
In a lighting circuit an open circuit will turn off the light.
A circuit is considered open if there is a gap in the path for electricity to flow, causing the current to stop. A circuit is closed when there is a complete, unbroken path for the electrical current to travel through.
A switch in a circuit controls the flow of electricity by opening or closing the circuit. When the switch is closed, it allows electricity to flow through the circuit, and when it is open, it stops the flow of electricity. Switches are commonly used to turn devices on and off.
An open circuit is a connection that is disconnected. This can cut off parts of the circuit, losing some key functions, or it can halt the circuit entirely.