How to Measure Battery Voltage?
2 Answers
Measuring battery voltage involves the following steps: 1. Select the appropriate range on the multimeter; 2. Connect the multimeter in series within the circuit; 3. Ensure the red probe allows current to flow in, while the black probe allows current to flow out; 4. Always connect an electrical appliance in the circuit, and never connect the ammeter directly to both ends of the battery. Battery voltage is typically 12V or 24V. Most household gasoline-engine cars use a 12V battery, while diesel engines, which operate differently from gasoline engines, require higher voltage and thus often use a 24V battery. The voltage of a 12V battery is not fixed and is usually slightly higher.
Checking car battery voltage is actually quite simple, and I often do it myself while driving. Get a digital multimeter, which can be bought online for around 20 yuan. Turn off the engine and open the hood to expose the battery. Set the multimeter to the DC voltage range, usually the 20V setting. Clip the black probe to the negative terminal of the battery (usually marked with a - or colored black) and the red probe to the positive terminal (marked with a + or colored red). Then read the display: a fully charged battery in good condition should show around 12.6 volts. If it's below 12.2 volts, be cautious as the battery might be aging and need charging or replacement. This method helps you detect battery issues early, avoiding being stranded due to a dead battery, saving repair costs and ensuring safety. Remember to check monthly, especially before cold weather sets in.
