What Causes Unstable Voltage in Cars?

[MacJulia]

Car voltage instability can be caused by the following reasons: 1. Prolonged use of in-car electrical devices while the engine is off (such as listening to the radio, watching DVDs, or using air conditioning); 2. Forgetting to turn off car electronics and interior lights after turning off the engine (such as using car chargers or GPS devices); 3. Frequent car starting. More information about car voltage is as follows: 1. If the magnitude and direction of voltage do not change over time, it is called steady voltage or constant voltage, simply referred to as DC voltage, represented by the uppercase letter U. 2. If the magnitude and direction of voltage change over time, it is called variable voltage. For circuit analysis, one of the most important types of variable voltage is sinusoidal alternating voltage (simply referred to as AC voltage), whose magnitude and direction change periodically over time following a sinusoidal pattern.