The colour bands indicate the value and tolerance of the part. The colours are specified in in standards published by the "Radio Manufactures Association" in North America. One (of many) handy pages that help explain how to read the code is here : http://www.radioremembered.org/rescode.htm .
There are many other similar pages out there.
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symbols of fixed resistors
No. A fixed resistor cannot be used as a dimmer in a lighting circuit. Depending on the dimming setting, you would need to dissipate substantial power across the resistor. What you need instead is some kind of pulse width modulated device, such as an SCR or TRIAC, or switching power supply, that does not dissipate a lot of power when it is turned on, because it operates in saturated mode, but the average power delivered to the load is what you want it to be.
If you cant find a spec sheet, take out a multi meter, set it to ohm mode and measure the thing. If its a variable find something in the same range, if its fixed you should be able to find a suitable replacement. If its a big resistor make sure you get a power resistor and not a standard ceramic one.
Conduit Bodies are usually grey or silver in color. They are made of metal, fiber, plastic or fixed clay. It is an electrical tubing used for protection and routing of electrical wiring.
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Because the actual resistor is too small to print numbers, so color bands and math are used instead. I just don't know how to calculate the values.
its the colour of the fixed and the variable we define it by its power and name
symbols of fixed resistors
Variable resistors means that a resistor which can change its resistance by control by any person or it self and fixed resistor means that it can not change its value.
To limit the current
A variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
those are the fixed resistor...u can't change their values..
Resistance is measured in ohms.
zero
Hi, where there is no need of changing the value of resistor then why do you place variable resistor instead a fixed resistor. After all the selection of resistor depends on the cause of use in application. by the way wide range of resistor values are avilable in the market. if the application requires tuning operation then variable resistor is need to be mounted. nothing is mandatory unless the application requires. Regards, Manjunath A.V
To lower the voltage and amperage in order to better fit the needs of other components.