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A special type of resistor whose resistance can be varied by varying the applied voltage is termed as a voltage dependent resistor (VDR) and is also simply called as varistor. It is a non-linear semiconductor element and its name is obtained from the words variable resistor.
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Description The Varistor block represents a voltage-dependent resistor (VDR). This component is also commonly known as a metal-oxide varistor (MOV). The block exhibits high resistance at low voltages and low resistance at high voltages.
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Hence the varistor is also called Voltage Dependent Resistor (VDR). The two standard symbols of varistor are shown below. IEEE standard symbol for varistor IEC standard symbol for varistor Generally , varistors are made from semiconductor materials. The voltage and current characteristics of a varistor are non linear in nature.
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A varistor is a voltage-sensitive resistor, i.e. its resistance value varies with change in applied voltage. It is also called a voltage-dependent resistor.. Length dependent resistor is a bipolar semiconductor resistor, whose resistance value depends on the intensity of incident light. i.e. when LDR is exposed to light its resistance value.
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The word varistor is formed by the combining variable and resistor.It is also known as voltage-dependent resistor, VDR whose resistance changes automatically with the corresponding change in the voltage across it.. It is always placed in shunt with the device being protected. This is basically done to protect the circuit from voltage surges.
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Network Resistors What is a linear resistor? Resistors that obey ohms law are called linear resistors. The resistance of these resistors does not change with the varying current flowing through it. Generally, resistors that obey ohm's law are 1. Fixed resistors 2. Variable resistors Fixed Resistors
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A varistor is a voltage dependent resistor (VDR). The resistance of a varistor is variable and depends on the voltage applied. The word is composed of parts of the words " var iable res istor. Their resistance decreases when the voltage increases. In case of excessive voltage increases, their resistance drops dramatically.
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It is also called "Voltage-Dependent Resistor" abbreviated as "VDR". The material of the resistor body of a varistor is a semiconductor, so it is a variety of semiconductor resistors. The "zinc oxide" (ZnO) varistor, which is now widely used, has the main material composed of the divalent element zinc (Zn) and the hexavalent element oxygen (O).
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Voltage ‐ Dependent Resistor • The inversion channel of a MOSFET can be seen as a resistor. • Since the charge density inside the channel depends on the gate voltage, this resistance is also voltage‐ dependent. EE105 Spring 2008 Lecture 16, Slide 7Prof. Wu, UC Berkeley Voltage.
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The English name is "Voltage Dependent Resistor" abbreviated as "VDR" or "Varistor". How does a varistor work? A varistor is a voltage-limiting protection device. By using the non-linear characteristics of a varistor, when an overvoltage occurs across a non-linear varistor, the varistor can clamp the voltage to a relatively fixed value, thus.
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Static Resistance Under normal operation the varistor has a very high resistance, hence part of its name, operating in a similar way to the zener diode by allowing lower threshold voltages to pass unaffected.
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They are also known by the name VDR [voltage dependent resistor] and have non-ohmic characteristics. Therefore, they come under non linear type of resistors.
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Metal Oxide Varistor is a voltage-dependent resistor that is made with ceramic powders of metal oxides like Zinc oxide and some of the other metal oxides like oxides of cobalt, manganese, bismuth, etc. A MOV consist of approximately 90% of Zinc oxide and a small amount of other metal oxides.
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MOSFET: Variable Resistor Notice that in the linear region, the current is proportional to the voltage Can define a voltage-dependent resistor This is a nice variable resistor, electronically tunable! DS n ox GS Tn DS( ) W ICVVV L =−µ 1 ( ) DS eq GS DS n ox GS Tn V LL RRV ICVVW Wµ == = −
