If you've ever used a modern space heater, a hair dryer, or enjoyed the quick warmth from an electric vehicle, you've likely benefited from PTC (Positive Temperature Coefficient) technology. Its killer feature? It’s self-regulating and incredibly safe. It physically can't overheat. But how? The answer lies in its most counterintuitive behavior: its resistance increases as its temperature rises.
你是否曾想过，为什么有些电暖器离开无人看管也不会着火？为什么你的电动汽车在寒冬里能快速吹出暖风，却又如此安全？这背后，都离不开一种看似简单却无比神奇的材料——PTC发热片。
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