Difference between revisions of "Resistors"
m |
|||
| (9 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
Resistors are passive electronic components. | Resistors are passive electronic components. | ||
| − | [[Image: | + | [[Image:DAQ1Resistors.jpg|thumb|Examples of 5% tolerance 1/4 W resistors. Note the "bumps."]] |
== Identification == | == Identification == | ||
Resistors' values are shown on the resistor, coded in a series of colored bands. | Resistors' values are shown on the resistor, coded in a series of colored bands. | ||
| Line 10: | Line 10: | ||
The 1% resistors have four bands showing their value: three significant figures, and then the number of zeros. | The 1% resistors have four bands showing their value: three significant figures, and then the number of zeros. | ||
| + | For most of the resistors found around here, the last band will indicate the tolerance. For 5% resistors, the tolerance band will be the fourth band and will be the color gold. For 1% resistors the tolerance band will be the 5th band and will be brown. | ||
| + | In which order do you read the bands--left to right or right to left? Good question! You must use your intuition here. On 5% resistors, this is easy: the first significant figure will never be gold. If you read a 1% resistor and come up with an unlikely number, then you're probably reading it backward. Also, the first band is closer to the edge than the last band; on resistors with bulges at the ends, the first band is the one on the bulge. | ||
| + | "three band" (usually 5%) resistor color code: | ||
{| class="wikitable" | {| class="wikitable" | ||
!Color!!1<sup>st</sup> band!!2<sup>nd</sup> band!!3<sup>rd</sup> band (multiplier)!!4<sup>th</sup> band (tolerance) | !Color!!1<sup>st</sup> band!!2<sup>nd</sup> band!!3<sup>rd</sup> band (multiplier)!!4<sup>th</sup> band (tolerance) | ||
|- style="background:black; color:white" | |- style="background:black; color:white" | ||
| − | | <font color=white>Black</font> ||0||0||×10<sup>0</sup>|| | + | | <font color=white>Black</font> ||0||0||×10<sup>0</sup>|| |
|- style="background:#654321; color:white" | |- style="background:#654321; color:white" | ||
| − | |<font color=white>Brown</font> ||1||1||×10<sup>1</sup> ||±1% (F) | + | |<font color=white>Brown</font> ||1||1||×10<sup>1</sup> ||±1% (F) |
|- style="background:#e02410; color:black" | |- style="background:#e02410; color:black" | ||
| − | |<font color=black>Red</font> ||2||2||×10<sup>2</sup> ||±2% (G) | + | |<font color=black>Red</font> ||2||2||×10<sup>2</sup> ||±2% (G) |
|- bgcolor = "#FF7F00" | |- bgcolor = "#FF7F00" | ||
| − | |Orange ||3||3||×10<sup>3</sup> || | + | |Orange ||3||3||×10<sup>3</sup> || |
|- bgcolor = "#FFFF00" | |- bgcolor = "#FFFF00" | ||
| − | |Yellow ||4||4||×10<sup>4</sup> || | + | |Yellow ||4||4||×10<sup>4</sup> || |
|- bgcolor = "#228b22" | |- bgcolor = "#228b22" | ||
|Green ||5||5||×10<sup>5</sup> ||±0.5% (D) | |Green ||5||5||×10<sup>5</sup> ||±0.5% (D) | ||
| Line 29: | Line 32: | ||
|Blue ||6||6||×10<sup>6</sup> ||±0.25% (C) | |Blue ||6||6||×10<sup>6</sup> ||±0.25% (C) | ||
|- style="background:#9400D3; color:white" | |- style="background:#9400D3; color:white" | ||
| − | |Violet ||7||7||×10<sup>7</sup> ||±0.1% (B) | + | |Violet ||7||7||×10<sup>7</sup> ||±0.1% (B) |
|- style="background:#808080; color:white" | |- style="background:#808080; color:white" | ||
|Gray ||8||8||×10<sup>8</sup> ||±0.05% (A) | |Gray ||8||8||×10<sup>8</sup> ||±0.05% (A) | ||
|- bgcolor = "#FFFFFF" | |- bgcolor = "#FFFFFF" | ||
| − | |White ||9||9||×10<sup>9</sup> || | + | |White ||9||9||×10<sup>9</sup> || |
|- bgcolor = "#D4AF37" | |- bgcolor = "#D4AF37" | ||
| − | |Gold || || ||×10<sup>-1</sup>||±5% (J) | + | |Gold || || ||×10<sup>-1</sup>||±5% (J) |
|- bgcolor = "#C0C0C0" | |- bgcolor = "#C0C0C0" | ||
| − | |Silver || || ||×10<sup>-2</sup>||±10% (K) | + | |Silver || || ||×10<sup>-2</sup>||±10% (K) |
|- | |- | ||
|None || || || ||±20% (M) | |None || || || ||±20% (M) | ||
| Line 43: | Line 46: | ||
| + | "four band" (usually 1%) resistor color code: | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | !Color!!1<sup>st</sup> band!!2<sup>nd</sup> band!!3<sup>rd</sup> band (multiplier)!! | + | !Color!!1<sup>st</sup> band!!2<sup>nd</sup> band!!3<sup>rd</sup> band!!4<sup>th</sup> band (multiplier)!!5<sup>th</sup> band (tolerance) |
|- style="background:black; color:white" | |- style="background:black; color:white" | ||
| − | | <font color=white>Black</font> ||0||0||×10<sup>0</sup> | + | | <font color=white>Black</font> ||0||0||0||×10<sup>0</sup>|| |
|- style="background:#654321; color:white" | |- style="background:#654321; color:white" | ||
| − | |<font color=white>Brown</font> ||1||1||×10<sup>1</sup> ||±1% (F) | + | |<font color=white>Brown</font> ||1||1||1||×10<sup>1</sup> ||±1% (F) |
|- style="background:#e02410; color:black" | |- style="background:#e02410; color:black" | ||
| − | |<font color=black>Red</font> ||2||2||×10<sup>2</sup> ||±2% (G) | + | |<font color=black>Red</font> ||2||2||2||×10<sup>2</sup> ||±2% (G) |
|- bgcolor = "#FF7F00" | |- bgcolor = "#FF7F00" | ||
| − | |Orange ||3||3||×10<sup>3</sup> || | + | |Orange ||3||3||3||×10<sup>3</sup> || |
|- bgcolor = "#FFFF00" | |- bgcolor = "#FFFF00" | ||
| − | |Yellow ||4||4||×10<sup>4</sup> || | + | |Yellow ||4||4||4||×10<sup>4</sup> || |
|- bgcolor = "#228b22" | |- bgcolor = "#228b22" | ||
| − | |Green ||5||5||×10<sup>5</sup> ||±0.5% (D) | + | |Green ||5||5||5||×10<sup>5</sup> ||±0.5% (D) |
|- style="background:#0000CD; color:white" | |- style="background:#0000CD; color:white" | ||
| − | |Blue ||6||6||×10<sup>6</sup> ||±0.25% (C) | + | |Blue ||6||6||6||×10<sup>6</sup> ||±0.25% (C) |
|- style="background:#9400D3; color:white" | |- style="background:#9400D3; color:white" | ||
| − | |Violet ||7||7||×10<sup>7</sup> ||±0.1% (B) | + | |Violet ||7||7||7||×10<sup>7</sup> ||±0.1% (B) |
|- style="background:#808080; color:white" | |- style="background:#808080; color:white" | ||
| − | |Gray ||8||8||×10<sup>8</sup> ||±0.05% (A) | + | |Gray ||8||8||8||×10<sup>8</sup> ||±0.05% (A) |
|- bgcolor = "#FFFFFF" | |- bgcolor = "#FFFFFF" | ||
| − | |White ||9||9||×10<sup>9</sup> || | + | |White ||9||9||9||×10<sup>9</sup> || |
|- bgcolor = "#D4AF37" | |- bgcolor = "#D4AF37" | ||
| − | |Gold || || ||×10<sup>-1</sup>||±5% (J) | + | |Gold || || || ||×10<sup>-1</sup>||±5% (J) |
|- bgcolor = "#C0C0C0" | |- bgcolor = "#C0C0C0" | ||
| − | |Silver || || ||×10<sup>-2</sup>||±10% (K) | + | |Silver || || || ||×10<sup>-2</sup>||±10% (K) |
|- | |- | ||
| − | |None || || || ||±20% (M) | + | |None || || || || ||±20% (M) |
|} | |} | ||
| Line 109: | Line 113: | ||
|} | |} | ||
== Use == | == Use == | ||
| + | |||
| + | == Examples == | ||
| + | === Four-band Resistor === | ||
| + | A resistor that has bands (starting from the band on the | ||
| + | part of the resistor with the largest radius) of blue-gray-brown-gold | ||
| + | will be: | ||
| + | <center> | ||
| + | <math> | ||
| + | \mbox{blue }\mbox{ gray }*\mbox{ brown }\pm\mbox{ gold} | ||
| + | </math> | ||
| + | </center> | ||
| + | resistor, or 68 * 10 = 680±5% Ω. | ||
| + | === Five-band resistor === | ||
| + | A | ||
| + | yellow-violet-red-white-silver resistor would be: | ||
| + | <center> | ||
| + | <math> | ||
| + | \mbox{yellow }\mbox{ violet }\mbox{ red }*\mbox{ white } \pm \mbox{ silver } | ||
| + | </math> | ||
| + | </center> | ||
| + | or 472 * 1000000000 = 472±10\% GΩ. | ||
| + | |||
| + | Note that the same value resistor will have a different multiplier band color in the four-band scheme than in the five-band scheme. A 1 kΩ resistor will be brown-black-red-TOL in the first case and brown-black-black-brown-TOL in the second. | ||
| Line 115: | Line 142: | ||
== External Links == | == External Links == | ||
| + | * Wikipedia page on [http://en.wikipedia.org/wiki/Electronic_color_code Electronic color code] | ||
| + | * [http://www.dannyg.com/examples/res2/resistor.htm Graphical resistance calculator] by Danny Goodman | ||
== References == | == References == | ||
<references /> | <references /> | ||
| + | |||
| + | [[Category:BME 153]] | ||
| + | [[Category:ECE 110]] | ||
| + | [[Category:ECE 382]] | ||
| + | [[Category:EGR 103]] | ||
| + | [[Category:EGR 224]] | ||
| + | [[Category:ME 344]] | ||
Latest revision as of 16:32, 19 February 2013
Resistors are passive electronic components.
Contents
Identification
Resistors' values are shown on the resistor, coded in a series of colored bands.
The resistors in labs here in Pratt are almost all 5% resistors or 1% resistors. That is, their actual values are either are guaranteed to be within 5% or 1% of the nominal, or labeled value.
The 5% resistors have three bands showing their value: two significant figures, and then the number of zeros.
The 1% resistors have four bands showing their value: three significant figures, and then the number of zeros.
For most of the resistors found around here, the last band will indicate the tolerance. For 5% resistors, the tolerance band will be the fourth band and will be the color gold. For 1% resistors the tolerance band will be the 5th band and will be brown.
In which order do you read the bands--left to right or right to left? Good question! You must use your intuition here. On 5% resistors, this is easy: the first significant figure will never be gold. If you read a 1% resistor and come up with an unlikely number, then you're probably reading it backward. Also, the first band is closer to the edge than the last band; on resistors with bulges at the ends, the first band is the one on the bulge.
"three band" (usually 5%) resistor color code:
| Color | 1st band | 2nd band | 3rd band (multiplier) | 4th band (tolerance) |
|---|---|---|---|---|
| Black | 0 | 0 | ×100 | |
| Brown | 1 | 1 | ×101 | ±1% (F) |
| Red | 2 | 2 | ×102 | ±2% (G) |
| Orange | 3 | 3 | ×103 | |
| Yellow | 4 | 4 | ×104 | |
| Green | 5 | 5 | ×105 | ±0.5% (D) |
| Blue | 6 | 6 | ×106 | ±0.25% (C) |
| Violet | 7 | 7 | ×107 | ±0.1% (B) |
| Gray | 8 | 8 | ×108 | ±0.05% (A) |
| White | 9 | 9 | ×109 | |
| Gold | ×10-1 | ±5% (J) | ||
| Silver | ×10-2 | ±10% (K) | ||
| None | ±20% (M) |
"four band" (usually 1%) resistor color code:
| Color | 1st band | 2nd band | 3rd band | 4th band (multiplier) | 5th band (tolerance) |
|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | ×100 | |
| Brown | 1 | 1 | 1 | ×101 | ±1% (F) |
| Red | 2 | 2 | 2 | ×102 | ±2% (G) |
| Orange | 3 | 3 | 3 | ×103 | |
| Yellow | 4 | 4 | 4 | ×104 | |
| Green | 5 | 5 | 5 | ×105 | ±0.5% (D) |
| Blue | 6 | 6 | 6 | ×106 | ±0.25% (C) |
| Violet | 7 | 7 | 7 | ×107 | ±0.1% (B) |
| Gray | 8 | 8 | 8 | ×108 | ±0.05% (A) |
| White | 9 | 9 | 9 | ×109 | |
| Gold | ×10-1 | ±5% (J) | |||
| Silver | ×10-2 | ±10% (K) | |||
| None | ±20% (M) |
5% Resistor Standard Values
| 10 | 11 | 12 | 13 | 15 | 16 | 18 | 20 | 22 | 24 | 27 | 30 |
| 33 | 36 | 39 | 43 | 47 | 51 | 56 | 62 | 68 | 75 | 82 | 91 |
1% Resistor Standard Values
| 100 | 102 | 105 | 107 | 110 | 113 | 115 | 118 |
| 121 | 124 | 127 | 130 | 133 | 137 | 140 | 143 |
| 147 | 150 | 154 | 158 | 162 | 165 | 169 | 174 |
| 178 | 182 | 187 | 191 | 196 | 200 | 205 | 210 |
| 215 | 221 | 226 | 232 | 237 | 243 | 249 | 255 |
| 261 | 267 | 274 | 280 | 287 | 294 | 301 | 309 |
| 316 | 324 | 332 | 340 | 348 | 357 | 365 | 374 |
| 383 | 392 | 402 | 412 | 422 | 432 | 442 | 453 |
| 464 | 475 | 487 | 499 | 511 | 523 | 536 | 549 |
| 562 | 576 | 590 | 604 | 619 | 634 | 649 | 665 |
| 681 | 698 | 715 | 732 | 750 | 768 | 787 | 806 |
| 825 | 845 | 866 | 887 | 909 | 931 | 953 | 976 |
Use
Examples
Four-band Resistor
A resistor that has bands (starting from the band on the part of the resistor with the largest radius) of blue-gray-brown-gold will be:
\( \mbox{blue }\mbox{ gray }*\mbox{ brown }\pm\mbox{ gold} \)
resistor, or 68 * 10 = 680±5% Ω.
Five-band resistor
A yellow-violet-red-white-silver resistor would be:
\( \mbox{yellow }\mbox{ violet }\mbox{ red }*\mbox{ white } \pm \mbox{ silver } \)
or 472 * 1000000000 = 472±10\% GΩ.
Note that the same value resistor will have a different multiplier band color in the four-band scheme than in the five-band scheme. A 1 kΩ resistor will be brown-black-red-TOL in the first case and brown-black-black-brown-TOL in the second.
Questions
Post your questions by editing the discussion page of this article. Edit the page, then scroll to the bottom and add a question by putting in the characters *{{Q}}, followed by your question and finally your signature (with four tildes, i.e. ~~~~). Using the {{Q}} will automatically put the page in the category of pages with questions - other editors hoping to help out can then go to that category page to see where the questions are. See the page for Template:Q for details and examples.
External Links
- Wikipedia page on Electronic color code
- Graphical resistance calculator by Danny Goodman
