What is non-linear resistance?

What is non-linear resistance?

Resistor That Isn't Linear Non-linear resistors are ones in which the electric current flowing through them vary with the applied voltage or temperature but does not follow Ohm's law. Non-linear resistors come in a variety of shapes and sizes, but the most common ones are shown below. The main types of non-linear resistors are: PTC (positive temperature coefficient) resistors, which increase in resistance when heated by current flow; NTC (negative temperature coefficient) resistors, which decrease in resistance when heated by current flow; RTV (resistance thermometer), a generic name for resistors whose resistance varies with temperature; ZTP (zero temperature coefficient) resistors, which remain constant regardless of temperature.

Non-linear resistance can be useful in certain situations. For example, PTC resistors can help control energy usage in areas where there is a risk of overloading circuits due to excessive use of electricity during periods of high demand. Non-linear resistors are also used in circuit protection because their behavior can help prevent damage to circuits if an overload condition occurs. For example, if a resistor starts to get too hot, its resistance will start to go up, preventing further current from going through it. This may be desirable if you have any other components in your circuit that you don't want to be damaged by excessive current.

Non-linear resistance can also be harmful if it is not used properly.

What’s the difference between linear and non-linear resistors?

The categorization is as follows. Non-linear resistors have non-linear VI properties, whereas linear resistors have linear VI characteristics. Non-linear resistors are resistors with non-linear voltage and current characteristics. The values of voltage and current fluctuate based on the input level, which can cause problems for circuits that depend on a constant value of resistance across a wide range of inputs.

In practical terms, this means that non-linear resistors cannot be used in applications where stability is important - such as audio or power circuits. They also produce more heat than linear resistors of the same value, so they should not be used where low resistance is necessary (such as power supplies).

Non-linear resistors were commonly used in older equipment that needed to generate its own voltage from a lower power supply line, such as microphone preamps or valve radio power supplies. They provide several advantages over linear resistors: 1 their resistance varies with the voltage applied, so they can increase the overall gain of a circuit without increasing the output voltage; 2 because of point #1, they do not load down the voltage when placed in series with a high-impedance input such as an antenna; 3 because of point #2, they do not draw current from the circuit itself, which may cause problems if the resistor is critical to keeping the circuit working.

What is the difference between linear and nonlinear resistance?

A component having linear resistance, in the most basic sense, will always give the same resistance regardless of the input voltage level. In contrast, the current in a nonlinear resistance component will be a function of the voltage drop across the component. For example, if you connect a light bulb to a power supply that uses a linear resistor as part of its circuit, the light bulb will burn out after a few hours due to excessive current flow.

Linear resistors are used in many circuits because they can handle high currents without breaking down. They are also very economical to use. Only positive voltages should be applied to linear resistors. Negative voltages may damage them.

Nonlinear resistors come in two types: those that break down under heavy load conditions (usually indicated by a red dot on the component), and those that don't (usually indicated by a green dot). Nonlinear resistors should not be connected in parallel with other components or systems that receive power from the same source as they prevent any negative effects on the damaged resistor from occurring to other components in the system.

When selecting nonlinear resistors, it is important to ensure that they are being used with appropriate equipment. For example, if you were to use a nonlinear resistor to limit the current through a motor, it would be important to select a type of resistor that can handle such a high current level.

About Article Author

Diana Bowles

Diana Bowles is a professor. She has a PhD in Education and English Literature. Diana teaches at an elementary school, and she loves her job because it allows her to share her love for learning with children each day. She volunteers as the president of the PTA at her school, where she spends time helping other parents find their voice to advocate for what they believe in.


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