Datasheet

ManualsBrandsSparkfun Electronics ManualsElectronic ComponentsResistor 100 Ohm 1/4 Watt PTH (20pk)

1/20/2018 Resistors - learn.sparkfun.com
https://learn.sparkfun.com/tutorials/resistors?_ga=2.11435260.915074398.1516331036-531257354.1515063447 1/10
Resistors


SHOP   LEARN   BLOG   SUPPORT
CONTRIBUTORS:   JIMB0
 FAVORITE 25
Take a Stance, The Resist Stance
Resistors - the most ubiquitous of electronic components. They are a critical piece in just about every circuit. And they play a major role in our favorite equation, Ohm’s Law.
In this, our pièce de résistance, we’ll cover:
What is a resistor?!
Resistor units
Resistor circuit symbol(s)
Resistors in series and parallel
Different variations of resistors
Color coding decoding
Surface mount resistor decoding
Example resistor applications
Consider reading…
Some of the concepts in this tutorial build on previous electronics knowledge. Before jumping into this tutorial, consider reading (at least skimming) these first:
What is Electricity?
Voltage, Current, Resistance, and Ohm’s Law
What is a Circuit
Series vs. Parallel Circuits
How to Use A Multimeter - Specifically check out the measuring resistance section.
Metric Prefixes
Resistor Basics
Resistors are electronic components which have a specific, never-changing electrical resistance. The resistor’s resistance limits the flow of electrons through a circuit.
They are passive components, meaning they only consume power (and can’t generate it). Resistors are usually added to circuits where they complement active components
like op-amps, microcontrollers, and other integrated circuits. Commonly resistors are used to limit current, divide voltages, and pull-up I/O lines.
Resistor units
The electrical resistance of a resistor is measured in ohms. The symbol for an ohm is the greek capital-omega: Ω. The (somewhat roundabout) definition of 1Ω is the
resistance between two points where 1 volt (1V) of applied potential energy will push 1 ampere (1A) of current.
As SI units go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. It’s very common to see resistors
in the kilohm (kΩ) and megaohm (MΩ) range (much less common to see miliohm (mΩ) resistors). For example, a 4,700Ω resistor is equivalent to a 4.7kΩ resistor, and a
5,600,000Ω resistor can be written as 5,600kΩ or (more commonly as) 5.6MΩ.
Schematic symbol
All resistors have two terminals, one connection on each end of the resistor. When modeled on a schematic, a resistor will show up as one of these two symbols:
Two common resistor schematic symbols. R1 is an American-style 1kΩ resistor, and R2 is an international-style 47kΩ resistor.
The terminals of the resistor are each of the lines extending from the squiggle (or rectangle). Those are what connect to the rest of the circuit.


Summary of content (10 pages)

PAGE 1
/20/2018 Resistors - learn.sparkfun.com   SHOP LEARN BLOG SUPPORT Resistors CONTRIBUTORS:  FAVORITE JIMB0 25 Take a Stance, The Resist Stance Resistors - the most ubiquitous of electronic components. They are a critical piece in just about every circuit. And they play a major role in our favorite equation, Ohm’s Law.
PAGE 2
1/20/2018 Resistors - learn.sparkfun.com The resistor circuit symbols are usually enhanced with both a resistance value and a name. The value, displayed in ohms, is obviously critical for both evaluating and actually constructing the circuit. The name of the resistor is usually an R preceding a number. Each resistor in a circuit should have a unique name/number.
PAGE 3
1/20/2018 Resistors - learn.sparkfun.com Peek inside the guts of a few carbon-film resistors. Resistance values from top to bottom: 27Ω, 330Ω and a 3.3MΩ. Inside the resistor, a carbon film is wrapped around an insulator. More wraps means a higher resistance. Pretty neat! Other through-hole resistors might be wirewound or made of super-thin metallic foil.
PAGE 4
1/20/2018 Resistors - learn.sparkfun.com Color Digit value Multiplier Multiplied Out Tolerance Black 0 100 1 Brown 1 101 10 Red 2 102 100 Orange 3 103 1,000 Yellow 4 104 10000 Green 5 105 100,000 Blue 6 106 1,000,000 Violet 7 107 10,000,000 Gray 8 108 100,000,000 White 9 109 1,000,000,000 Gold ±5% Silver ±10% Here’s an example of a 4.7kΩ resistor with four color bands: When decoding the resistor color bands, consult a resistor color code table like the one above.
PAGE 5
1/20/2018 Resistors - learn.sparkfun.com 16 143 32 210 48 309 64 453 80 665 96 976 The letter at the end represents a multiplier, matching up to something on this table: LetterMultiplier LetterMultiplier LetterMultiplier Z 0.001 A 1 D 1000 Y or R 0.01 B or H 10 E 10000 X or S 0.1 C 100 F 100000 So a 01C resistor is our good friend, 10kΩ (100x100), 01B is 1kΩ (100x10), and 01D is 100kΩ. Those are easy, other codes may not be. 85A from the picture above is 750Ω (750x1) and 30C is actually 20kΩ.
PAGE 6
1/20/2018 Resistors - learn.sparkfun.com So, for example, if you just have to have a 12.33kΩ resistor, seek out some of the more common resistor values of 12kΩ and 330Ω, and butt them up together in series. Parallel resistors Finding the resistance of resistors in parallel isn’t quite so easy. The total resistance of N resistors in parallel is the inverse of the sum of all inverse resistances. This equation might make more sense than that last sentence: N resistors in parallel.
PAGE 7
1/20/2018 Resistors - learn.sparkfun.com When sizing out a current-limiting resistor, look for two characteristic values of the LED: the typical forward voltage, and the maximum forward current. The typical forward voltage is the voltage which is required to make an LED light up, and it varies (usually somewhere between 1.7V and 3.4V) depending upon the color of the LED.
PAGE 8
1/20/2018 Resistors - learn.sparkfun.com Here a resistor R1 and a photocell create a voltage divider to create a variable voltage output. Pull-up Resistors A pull-up resistor is used when you need to bias a microcontroller’s input pin to a known state. One end of the resistor is connected to the MCU’s pin, and the other end is connected to a high voltage (usually 5V or 3.3V). Without a pull-up resistor, inputs on the MCU could be left floating.
PAGE 9
1/20/2018 Resistors - learn.sparkfun.com Resistor 10K Ohm 1/6th Watt PTH - 20 pack Power Resistor Kit - 10W (25 pack)  COM-11508  KIT-13053 $0.95 $5.
PAGE 10
1/20/2018 Resistors - learn.sparkfun.com https://learn.sparkfun.com/tutorials/resistors?_ga=2.11435260.915074398.1516331036-531257354.