Does 'on' represent normally open or normally closed?
2 Answers
on represents normally open. After pressing the 'on' button, the function is in the working state. The corresponding 'off' button is the shutdown button. After pressing the 'off' button, the function is in the off state. Functional buttons on cars are divided into: 1. 'mute' is the mute button, used to control the mute mode of multimedia; 2. 'mode' is the mode button, used to switch multimedia modes; 3. 'gps' is the locator, used for vehicle positioning tracking, driving trajectory playback, electronic fencing, and fuel monitoring; 4. 'set' with an exclamation mark is the tire pressure monitoring button, which will alarm immediately when the tire pressure is insufficient; 5. 'sync' is the dual-zone air conditioning adjustment. The red light indicates synchronized temperature adjustment, and turning it off means adjusting the air conditioning temperature on both sides separately.
When discussing the terminology of electrical switches, 'on' refers to the closed state after the switch is activated, rather than directly indicating normally open or normally closed. Let me explain: A normally open switch is disconnected in its default unoperated state, meaning it's in the 'off' position. Only when you press or activate it does it switch to 'on', allowing current to flow. Conversely, a normally closed switch is closed by default, in the 'on' state with current flowing normally, and it opens to 'off' when activated. In my experience, this is particularly crucial in automotive circuits, such as headlight relays. If you examine a relay, its normally open contacts will turn on the headlights only when ignited, while normally closed contacts remain powered by default. Understanding this distinction helps troubleshoot issues—for example, if vehicle lights suddenly illuminate, it might indicate normally closed contacts are operational. In automotive design, normally open switches are often used in safety systems to deactivate certain functions during collisions, ensuring passenger safety. Overall, the stability of automotive electrical systems relies on these fundamental concepts.
