Voltage-dependent resistors varistors

Example 3 GBs in ZnO are processed intentionally to include a glass film. This film allows the ceramic to be used as a varistor (voltage-dependent resistor), a device that protects circuits from high-voltage spikes (Chapter 30). Figure 14.38 illustrates an IGF of varying thickness in ZnO and how this film controls the resistance. [Pg.266]

Lightning Arrester One of the earliest applications of SiC was that of a Ughtning arrester in electrical power systems. The principle of this is based on the varistor (= variable resistor or voltage-dependent resistor, VDR) properties of SiC that is, the dependence of the resistance of the semiconducting SiC on the voltage applied. [Pg.437]

Constant voltage devices in everyday use are avalanche and zener diodes and varistors, or voltage dependent resistors. [Pg.112]

Voltage-dependent resistors (varistors) resistance varies with voltage... [Pg.842]

Varistors are semiconductors that are used as resistors having a nonohmic behavior. At low voltage differences over the resistor, these varistors behave as weakly temperature-dependent (NTC) resistors but above a critical voltage difference Vc over the material the resistance drops sharply (Figure 9.10). This is a... [Pg.335]

Nonlinear resistor A resistor with a value that depends strongly on some external parameter such as temperature (thermistor) or voltage (varistor). [Pg.164]

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