What is the voltage of a car cigarette lighter?

[MatthewFitz]

The voltage of a car cigarette lighter depends on the following situations: 1. Large transport vehicles are generally 24V, while small cars are usually 12V, with a current not exceeding 12A. 2. The maximum current that the car cigarette lighter circuit can withstand is generally 10A (some are 20A). Based on a 12V voltage calculation for the cigarette lighter socket, if the total power of the car appliances exceeds 120W, the cigarette lighter circuit will be overloaded. 3. It is advisable to avoid using appliances with a power exceeding 120W in the car. It is also important to note that you should not continue to draw power from the cigarette lighter socket when the vehicle is turned off, as this can easily deplete the battery, making it impossible to start the car again. If the power of the car appliance is too high and causes circuit overload, the battery may be damaged.