When testing a set of N.C contacts with a DMM, what will the reading be when the switch is activated?

When testing a set of normally closed (N.C.) contacts with a digital multimeter (DMM), the expected reading when the switch is activated reflects the nature of N.C. contacts. Normally closed contacts allow current to flow when the switch is in its default state (not activated). Upon activation, these contacts open, interrupting the current flow.

Therefore, when the switch is activated, the N.C. contacts open, leading to a situation where there is no voltage present across the contacts. As a result, the multimeter will read 0 voltage, indicating that the circuit is open and current is no longer flowing where it previously did when the switch was not activated. This behavior is fundamental to understanding how N.C. contacts operate in a control circuit, reinforcing the concept of their functioning in different states.