在购买半导体制冷器件时,不可能带着大容量的电源去测试制冷器件的好坏,此时可用两节5号电池接在半导体制冷块的两端(见图1),大约30s左右如果半导体制冷块有一面明显发凉,一面明显发热就说明半导体制冷块是好的。因半导体制冷块耗电较大,5A的制冷块,用两节5号电池供电时,电流会 In the purchase of semiconductor refrigeration devices, it is impossible to test the quality of refrigeration devices with a large capacity of the power supply, this time can be used two batteries No. 5 connected to both ends of the semiconductor cooling block (see Figure 1), about 30s If the semiconductor One side of the cooling block was obviously cool, while the obvious fever on the semiconductor cooling block is good. Due to the large power semiconductor cooling block, 5A cooling block, with two AA batteries, the current will be