Final answer:
When a relay is energized, the Normally Closed (NC) contacts are the ones that open, while the Normally Open (NO) contacts close, allowing the relay to switch circuits on or off.
Step-by-step explanation:
When a relay is energized, the Normally Open (NO) contacts close and the Normally Closed (NC) contacts open. This operation is based on the physical design of the relay. When it is at rest (de-energized), the NO contacts are open, preventing current flow, and the NC contacts are closed, allowing current to pass through. Upon energization, an electromagnet within the relay activates, which causes the NO contacts to close (creating a circuit) and the NC contacts to open (breaking the circuit).
When a relay with both Normally Open (NO) and Normally Closed (NC) contacts is energized, the Normally Open contact is open.
A relay is an electrical switch that is controlled by an electromagnet. When the electromagnet is energized, the Normally Open contact closes, allowing current to flow through it. At the same time, the Normally Closed contact opens, breaking the circuit. This behavior is due to the design of the relay and its internal components.
For example, let's say we have a relay with a Normally Open contact connected to a light bulb. When the relay is energized, the Normally Open contact closes and completes the circuit, turning on the light bulb.