Question

when is a circuit considered an open circuit? when the circuit is off when a circuits switch is closed when the circuit is on when the circuit is complete

Explanation:

An open circuit means there is a break in the circuit, so no current can flow. When the circuit is "off", there is a break (like a switch being open), which is the definition of an open circuit. When a circuit's switch is closed, it's a closed circuit. When the circuit is "on" or complete, it's also a closed circuit allowing current flow.

Answer:

when the circuit is "off"