Matching resistance estimation method: According to Ohm's law, the estimated resistance value is equal to the battery voltage divided by the expected discharge current. The selection of resistance power is more than twice the result of the battery voltage multiplied by the expected discharge current. It should be noted that the full charge voltage of the battery is relatively high, and it should be ensured that the current cannot exceed 3.0A at full charge voltage! For example, if a 12V battery needs to be tested with a 2A current, a resistance of 6 Ω and a power of 50W are required. The new 12V battery has a full charge voltage of approximately 13.5V, and the corresponding maximum current is 13.5/6=2.25A, which is less than 3A and can be used. In addition, if using a light bulb for testing, the maximum current can only be taken as half (1.5A) because the cold resistance of the light bulb is very low, and the starting impulse current is very high. Choosing too much may directly burn out the circuit!!!!
Attention: During the use of resistor discharge, the resistor load will generate severe heat. Please pay attention to safety!
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