Electronic Security Technician Level 1 Practice Exam

A normally open contact is a type of electrical switch that remains open (not allowing current to flow) until it is activated. When activated, typically by some form of force such as a magnetic field, the contact closes, allowing electrical potential (current) to flow through it.

In the context of the question, a normally open contact does allow potential to move through it when it is closed, which can occur under the influence of a magnetic field. For example, in a relay system, a magnetic field can actuate a normally open contact to close the circuit, thereby allowing current to flow.

This fundamental function of normally open contacts is critical in understanding how many electronic systems and security devices operate, as they are often used to control the flow of current in response to external stimuli. Understanding this basic operation reinforces the principles of electronic security systems and their functions in real-world applications.