RESISTORS
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Resistors are components, which resist or limit the flow of electric current in a circuit. They are designed to protect a circuit. The unit of measure is the ohm.
An additional important characteristic is the wattage rating which indicates the power needed for the resistor to function.
Resistors are rated with a tolerance, which indicates the upper and lower limits of variation from a components nominal value i.e., an allowable deviation. These ratings are usually indicated by a % value. The lower the % ratings are on a part the better the tolerance.
Most film resistors are identified by a system of different color bands indicating the ohms, tolerance and a failure rate when applicable.
The wattage rating is determined by size. Here is a chart of the size for most film resistors.
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Rating power
(W) |
Thickness
(mm) |
Length
(mm) |
| 1/8 |
2 |
3 |
| 1/4 |
2 |
6 |
| 1 |
3.5 |
12 |
| 2 |
5 |
15 |
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Resistors are produced in many styles and can be composed of a variety of different materials, each of which provides its unique resistance properties.
Some of the styles you can find in stock at TEDSS are: |
| Adjustable Wireound |
MELF |
Thick Film Surface Mount Chip |
| Aluminum Wirewound |
Metal Film |
Thin Film Surface Mount Chip |
Axial Wirewound
(Silicon &Vitreous Enamel) |
Metal Oxide |
Tubular Wirewound |
| Carbon Composition |
Potentiometers |
Variable Cermet and Wirewound |
| Carbon Film Ceramic Cased (Sandstone) Wirewound |
Resistor Networks |
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| Fixed Cermet |
Rheostats |
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| In TEDSS extensive inventory you will find both popular brands and hard to find such as: |
| Allen Bradley |
Futaba |
Mepco |
S.E.I (Stackpole) |
| Angstrom |
Hardwick |
Meritek |
Shallcross |
| B I Technology (formerly Beckman Industrial) |
Huntington Electric |
Milwaukee Resistor |
Spectrol |
| Bourns |
Iskra |
Ohmite |
Tel-Labs |
| Bradford (BEI) |
IRC |
Pacific |
Tocos |
| Caddock |
Jaro |
Philips |
Tru-Ohm |
| Cal-R |
Kelvin |
Piher |
Vishay |
| Clarostat |
KOA |
RCD |
Vitrohm |
| Colber |
KRL |
RCL |
Ward Leonard |
| Corning (CGW) |
Ktronics |
R.G.Allen |
Yageo |
| CTS |
Lectrohm |
Rohm |
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| Dale |
Memcor |
Sage |
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