see Resistor, Variable.
A variable resistor. A device which does not have a linear resistance characteristic.
a component that changes resistance with the amount of voltage impressed across it
a device specifically designed to have a well-defined voltage-dependent resistance
an electronic component designed to protect circuits against excessive voltage
a resistor that has a resistance that varies with temperature
a resistor whose resistance depends on the applied voltage
a two-electrode active or passive semiconductor device with a voltage dependent nonlinear resistance which falls significantly as the voltage is increased
a type of resistor with a significantly non-ohmic current -voltage characteristic
a very rugged voltage clamping device capable of absorbing very large currents without damage
a voltage dependent, nonlinear device that has an electrical behavior similar to back-to-back Zener diodes
A voltage-dependent variable resistor. Normally used to protect sensitive equipment from power spikes or lightning strikes by shunting the energy to ground.
A semiconductor device with a voltage dependent resistance that drops markedly as the applied voltage is increased.
A semiconductor device with voltage-sensitive resistance, commonly used as a lightning arrester. Overvoltages can be passed quickly, but operating voltages have no effect.
A varistor is an electronic component with a significant non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor. Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from the sensitive components.