Final answer:
Normally closed means the contact is closed when the relay is off.
Step-by-step explanation:
The subject of this question is Engineering.
Normally closed means the contact is closed when the relay is off. In electrical engineering, a relay is an electrically operated switch that opens or closes a contact when the input signal is present or absent. When the relay is off, meaning there is no input signal, the contact is closed.
For example, in a circuit where a relay is used to control a light bulb, when the relay is off, the contact is normally closed, and the light bulb is turned on.