Nonlinear Resistors
Nonlinear Resistors - Related Videos
11:34
Series and Parallel Resistors
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN This experiment demonstrates how current is distributed in resistors connected in series or parallel, and thus describes how to calculate the total "effective" resistance. Using Ohm's law, it possible to convert between the voltage and current through a resistance, if the resistance is known. For two resistors connected in series, (meaning that they are wired one after the...
01:10
Resistors In Series
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2023
A resistor is an ohmic device that limits the flow of charge in a circuit. Most circuits have more than one resistor. If several resistors are connected together and connected to a battery, the current supplied by the battery depends on the equivalent resistance of the circuit. The equivalent resistance of a combination of resistors depends on both their individual values and how they are connected. The simplest combination of resistors is the series combination. In a series circuit, the...
01:18
Combination Of Resistors
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2023
Electrical devices in any circuit can be connected either by series or parallel connections. Additionally, circuits can be connected involving both of these connections, known as combination or complex circuits. As these circuits have complex resistor connections, it is necessary to identify different parts as either series or parallel connections, then the whole combination of series and parallel resistors can be reduced to a single equivalent resistance. With the known equivalent resistance...
01:23
Resistors In Parallel
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2023
Resistors are in parallel when one end of all the resistors are connected to a continuous wire of negligible resistance and the other end of all the resistors are also connected to one another through a continuous wire of negligible resistance. In the case of a parallel configuration, the potential drop across each resistor is the same. Current through each resistor can be found using Ohm’s law, I = V/R, where the voltage is constant across each resistor. The sum of the individual currents...
01:22
Nonlinear Pharmacokinetics: Causes of Nonlinearity
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2025
Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens. Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
FAQs
The current-voltage response changes as the applied voltage, current, temperature, or another operating condition changes. Consequently, the same component can present different resistance values during different portions of circuit operation. Engineers examine this changing relationship to predict whether the device will limit conduction, respond near a threshold, reach saturation, or provide a temperature-dependent signal.
Threshold behavior allows a component to respond strongly only after an operating condition reaches a particular region, while saturation limits or alters the response as that condition increases further. These characteristics influence switching, waveform shaping, and protection performance. Understanding them helps engineers anticipate when conduction begins, how the signal changes, and how the circuit behaves outside its normal range.
A constant-resistance component supports a proportional relationship between voltage and current, whereas a nonlinear resistor can change its effective resistance as operating conditions vary. This difference makes its behavior dependent on the circuit state rather than on one fixed value. Engineers therefore rely on the component's current-voltage characteristics when predicting performance, selecting devices, or designing signal-conditioning functions.
Selection begins with the operating condition that controls the desired response, such as voltage for surge suppression or temperature for sensing. Engineers then consider the relevant current-voltage or resistance-temperature behavior, including threshold or saturation effects where applicable. Matching that characteristic to the circuit's protection, measurement, control, switching, or waveform-shaping requirement supports more predictable operation.
Varistors use voltage-dependent conduction to suppress surges. In a protection design, the engineer evaluates how the device responds as voltage changes and places that behavior within the circuit's expected operating conditions. The resulting application helps protect circuitry from excessive voltage while preserving the intended behavior during ordinary operation, making the voltage-dependent characteristic central to component selection.
Thermistors convert temperature changes into measurable resistance changes. A circuit can therefore monitor the resulting electrical variation and use it for sensing or control. Their value in engineering comes from linking a thermal condition to an electrical signal, which supports temperature-dependent measurement and regulation rather than relying only on voltage-driven protection behavior.