Thermistor: This is a type of resistor whose resistance varies significantly with temperature, more so than in standard resistor. Thermistors are widely used as inrush current limiters, temperature sensors, self-resetting over-current protectors, and self-regulating heating elements.
Varistor(For surge protection and automotive application): Varistors, variable resistors, are voltage-dependent resistors with bidirectional and symmetrical V/I characteristics. The major function is to protect equipments from being damaged by over voltage transient.
LED(Light-emitting diode): This is a...