What Is A Resistor?
A resistor is nothing magic. Take a long wire and measure the resistance, and you will realize that resistance is just a normal property of wires (except for superconductors).
Some resistors are made up of just that. A long wire.
But you can also find resistors made of other types of materials. Like this carbon film resistor:
What Does The Resistor Do To My Circuit?
The resistor is a passive device and doesn’t do anything actively to your circuit.
It’s actually a pretty boring device. If you add some voltage to it, nothing really happens. Well, maybe it gets warm, but that’s it.
BUT, by using resistors, you can design your circuit to have the currents and voltages that you want to have in your circuit.
So the resistor gives the designer control over his circuit! How about that?
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors reduce current flow in electronic circuits, a property that is utilized to adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses. High-power resistors that can dissipate many watts of electrical power as heat may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements (such as a volume control or a lamp dimmer), or as sensing devices for heat, light, humidity, force, or chemical activity.
Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment. Practical resistors as discrete components can be composed of various compounds and forms. Resistors are also implemented within integrated circuits.
The electrical function of a resistor is specified by its resistance: common commercial resistors are manufactured over a range of more than nine orders of magnitude. The nominal value of the resistance falls within the manufacturing tolerance, indicated on the component.
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors reduce current flow in electronic circuits, a property that is utilized to adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
![100KOhm [100K Ω 1/4W], 1/4 Watt Carbon Film Resistor (Pack of 10)](https://ccdn.veerobot.com/image/cache/catalog/Images/Components/Electronic-Components/Resistor/resistor-carbon-film-1000x1000.jpg)
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