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BJB electrical components are sensor resistors whose resistance changes with temperature. According to different temperature coefficients, they are divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance of positive temperature coefficient thermistors increases as temperature rises, while the resistance of negative temperature coefficient thermistors decreases as temperature rises; both belong to semiconductor devices. BJB electrical component principle: A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil, secondary coil, and iron core (magnetic core). In electrical equip