Final answer:
A circuit with a switch turned to the OFF position or a circuit with any break is called an open circuit. When the circuit is open, no current can flow through it.
Step-by-step explanation:
In physics, a circuit with a switch turned to the OFF position or a circuit with any break is called an open circuit.
When the switch is turned OFF or there is a break in the circuit, the path for the current to flow is interrupted, and no current can pass through the circuit.
For example, if you have a light bulb connected to a battery with an open switch, the light bulb will not light up because the circuit is open and the current cannot flow through it.