How to Identify the Positive and Negative Terminals of a Car Battery?
1 Answers
The method to identify the positive and negative terminals of a car battery is as follows: You can determine the polarity based on the symbols marked on the battery. Generally, the positive terminal is marked with a '+' symbol, while the negative terminal is marked with a '-' symbol. When the polarity markings on the battery are unclear or faded, you can identify the terminals by their color. Typically, a red terminal indicates the positive pole, and a blue terminal indicates the negative pole. Additional information: A car battery is a type of battery, also known as a storage battery, which works by converting chemical energy into electrical energy. The commonly referred-to car battery is a lead-acid battery, which mainly uses lead and its oxides as electrodes and a sulfuric acid solution as the electrolyte. There are various types, including lead-acid batteries, nickel-iron batteries, and nickel-cadmium batteries. In a lead-acid battery, the positive electrode is lead dioxide, the negative electrode is lead, and the electrolyte is a dilute sulfuric acid solution. During discharge (use), the positive and negative electrodes react with sulfuric acid to form lead sulfate. When the concentration of the sulfuric acid solution drops to a certain level, the battery must be recharged. Using an external power source for charging can restore the electrodes and electrolyte to their original state, allowing the battery to be used again after charging.
