Resistors are electrical components that are intended to build resistance and regulate electric current flow. These passive components are usually found in electronic circuits and electrical networks. Resistors are made of carbon or metal wire. It stabilizes resistance value through various conditions. Regardless of its type, all resistors have a uniform look. Its shape is similar to that of a small worm and has two connections – one on each side. These are what connect the resistor to the circuit. There are two general types of resistors: fixed and variable.
Resistors are typically used in/for the following applications:
- Power control circuits
- High-frequency instruments
- Filter circuit networks
- DC power supplies
- Wave generators
- Instrumentation applications
- Modulators and demodulators
- Medical instruments
- Digital multimeters
- Feedback amplifiers
- Voltage regulators
Types of Resistors
Fixed resistors are the most common and popularly used type. These resistors are essential in creating the proper circuit conditions for EC. Fixed resistor values should not be altered just to adjust the circuit because these were already pre-determined during the design stage.
Common examples of fixed resistors are:
- Carbon composition
- Metal oxide film resistor
- Carbon film
- Metal film resistor
- Surface wound resistors
- Wire wound resistors
Variable resistors are equipped with an element from a fixed resistor. It’s also outfitted with a slider. By tapping into the main resistor element, this slider creates three connections – the first two are connections to the main element and the third one is through the slider itself.
The most common examples of variable resistors are:
Additionally, there are two types of variable resistors: adjustable and preset.
Adjustable variable resistors are commonly used on radios, for purposed related to tone or volume controls. These resistors come with a spindle and a knob.
Preset variable resistors are used during the manufacturing stage, particularly in production set-up stages.