What is the RPM for an automatic transmission?

[VanJason]

Generally, the idle speed of a car ranges between 1200~1500 RPM. When the water temperature is normal, the idle speed usually stabilizes at 800~900 RPM. Below is an introduction to automatic transmissions: 1. How the P gear works: The letter 'P' in P gear comes from the word 'Park,' meaning parking gear. Regardless of the type of automatic transmission, when in P gear, a pawl mounted on the transmission housing engages with the gears inside the transmission, locking the entire transmission's drive components, thereby securing the entire drivetrain of the car to prevent rolling when the handbrake is forgotten. 2. Handbrake: The handbrake works by activating the braking system, which locks the wheels to secure the vehicle. If you engage the P gear first and then pull the handbrake, the task of securing the vehicle is undertaken by the ratchet and gear engagement in the transmission, meaning the moving parts inside the automatic transmission are under tension. Conversely, if you pull the handbrake first and then engage the P gear, the entire braking effort is borne by the braking system, with the P gear only serving as an auxiliary brake, leaving all internal moving parts in a completely relaxed state.