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Resistor Networks, Arrays, are comprised of multiple resistors connected together, either in series, parallel, or combinations thereof, to achieve a desired electrical result. These resistor networks can contain both fixed and variable resistors, each of which have a particular application field and working principle.

Fixed resistors are those that, once set to a specific resistance value, remain at that value until changed manually. Commonly used in power supplies and other circuits requiring "set-value resistors," the most popular type of fixed resistor is the carbon-composition resistor. This type of resistor contains a combination of carbon and clay, pressed into a cylindrical shape, which provides a desired resistance value. Fixed resistors can also include metallic resistors, which are composed of a coil of metal wound around a ceramic substrate, and through-hole resistors which contain two gold plated terminals through which current flows.

Variable resistors, also known as potentiometers, are resistors whose resistance value can be varied. The most common type of variable resistor is the potentiometer, which takes the form of a rotary knob or scroll wheel. These are used to control the amount of current that flows through a circuit. By adjusting the knob, the resistance of the resistor can be changed ranging from an unmeasured value, to a maximum resistance value. Other types of variable resistors include photoresistors, which can measure the amount of light that is present, and thermistors, which measure temperature changes.

Resistor networks can also be comprised of both fixed and variable resistors. In this type of configuration, each resistor is assigned a specific role in the circuit, and is then connected together in order to achieve a desired result. As an example, a series-parallel network has two resistors connected in series, followed by a third resistor connected in parallel to the combination of the first two. This type of resistor network is commonly used in applications requiring two different resistances. These networks can also contain more resistors connected in either series or parallel, depending on the type of network.

Resistance networks are used in a variety of applications ranging from amplifiers to power supplies. In an amplifier circuit, the resistors are used to control the amount of current passing through the amplifier, while in a power supply circuit they are used to regulate the voltage output. Resistor networks can also be used to provide signal isolation between two points, as well as to reduce noise in a circuit. In all of these applications, understanding the application field and working principle of resistor networks is crucial in order to ensure proper operation.

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