VARISTOR Meaning and
Definition
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A varistor is an electronic component that is used to protect electronic circuits from voltage surges or transients. It is a type of voltage-dependent resistor that exhibits nonlinear current-voltage characteristics. The name "varistor" is a combination of "variable" and "resistor."
Varistors consist of a ceramic or metal oxide semiconductor material, such as zinc oxide, that is sandwiched between metal electrodes. The resistance of a varistor is high at low voltages, which allows it to act as an insulator and consume very little power. However, as the voltage across the varistor exceeds its threshold voltage, its resistance drops sharply, allowing it to conduct electricity and protect the circuit by diverting the excess current.
Varistors are commonly used in electronic devices to suppress and absorb transient voltages caused by lightning strikes, power surges, or sudden changes in voltage. They act as a safety valve, dissipating excess energy and protecting sensitive electronic components from damage. Varistors are often used in power supplies, telecommunication systems, surge protectors, and industrial equipment.
The voltage at which a varistor conducts and the amount of energy it can absorb depends on its design characteristics and voltage rating. Varistors have a finite lifespan and may degrade over time due to heat or prolonged exposure to voltage transients. Therefore, they may need periodic replacement or use in conjunction with other protective devices to ensure the longevity and reliability of electronic circuits.
Common Misspellings for VARISTOR
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