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I'm trying to do the evaporator workaround for the Ford Fusion. Instructions from this page say to use 37kOhm 1/8 watt resistor. No one has this. Can I use other wattage rated resistors such as 47 kOhm 1/2 or 1/4 watt ?

Please help me! I can't seem to understand the values of resistors and how they affect current and voltage. I have a 7.5 volt, 350 milliamp circuit that I would like to limit to 5 volts, and if possible raise the current to 500 milliamps. How could I do it?

I bought 100 leds of ebay a while ago and it came with 100 free resistors. What im not too sure about is what ohm they are. On the ebay page it dosent say if they go with the leds the shop specialises in leds and gives similar resistors with almost every order. All it says on the page is that there perfect for working with 12v or something. I tried looking at those colour code calulators but I still couldnt figure it out. I knew someone here must know. The colours in the pic arent great so I wrote what they are aswell.

For people who don't know, how do you connect a resistor to a LED light?

How many ohm resistor would i need to resist 7 volts to 3.5 volts and 12 volts to 3.5 volts also....

Ok, I want to have a thing where ive got a battery pack, and then 3 toggle switches and one button switch, each one that is flipped/pushed lights up an LED and then the last one (button) lights up both the led and powers a small hobby motor or something like that. My question is, What do I need resistor-wise? (quantity, location, strength..) Thanks!Amendment I want to have the same idea going, but kind of have an extension cord running through it, so I plug the box in, and then plug something into a cord coming from the box.

So a resistor reduces the current, what would increase the "speed" of the current? Is there such thing?

Sir I need 100ohm 3 watt resistor but cannot find it in market, in market I find 100ohm 1watt resistor ,plz tell me how I acquire (100ohm 3 watt resistor) value. can I parallel three 100ohm 1 watt resistor to get my value

I was just wondering if there is some kind of marking on a resistor that tells you which direction you should read it. I've seen brown bands on the ends of some resistors but not always, so I was just wondering if someone could help me out. Thanks Zealous

Hey guys got a question. I want to add an ultra bright LED from my mini mag light to my atx benchtop power supply. The LED ran off 3v (2 AA’s.) The line I want to use is the 3.3v (14 amp) from the atx to power it. What size/power rating resistor should I use?

I have been having difficulties with a PSU construction for a formerly battery driven (unknown amperage, 18 v ) electric drill and first needed help in identifying a part; picture included:  

I know how to use ohms law to calculate what size resistor I need but what I really need to know is how to tell/calculate what watt rating I need to use whether it be 1/4, 1/2, 1/8, 1,10 and so on.

I'm building an LED circuit and I have the right ohm but the W is 1/2 when 1/4 was calculated out?

Hi Guys,   I built a power supply (half wave rectifier) for a project. It simply rectifies normal 120VAC and gives me a pulsed 120VDC output. The resistors are rated for 20 Watts (I calculated that I only needed 4.32 Watts), but they still seem to get extremely hot and I think they are beginning to break down. Is there any way I could put a heat sink on them? Thanks

I notice a lot of people tell you to always put a resistor on an LED. Should I use a resistor if my LED's forward voltage is the same as my power supply?

Can any one tell me how can we use and install resistors and capacitors? And how can we study the resistors and capacitors

Hi, Is it possible to create a 16.5-17Khz speaker output using only resistors? or should I look into a 555 timer? if so, how? Thanks, Dan

What reading solar resistor should i use for transfering sound on a laser for my project?

This might sound stupid, but being brand new to electronics i need to pose this question, i found a scematic with 3 resistors on, 1 is a variable rated as R1 100K, the second R2 1K, the third R3 270R, the problem is the third resistor, what does the "R" stand for?

I`ve been searching around everywhere about Resistors and how to use them, I understand that they resist power to the LED light t to a safe limit, but I need a noobs guide on how to use them, can someone help me?

I just got a back of about 130 resistors for a bag of 50 L.E.D's but some of the resistors ive never heard of, there are a few like 100ohm and 560 ohm but now im getting 1m ohm and 4.1Mohm and 100K ohm,1.5K ohm and 1K ohm. Ive never seen resistors like this before, i am very basic in electronics but i took a class at school have have made many many projects but never resistors like this and i only wanted to use them for a few L.E.D's, I dont really know what im asking for in here but i just sapose if anyone has any help or ideas or really anything with these resistors and matching them with L.E.D'S?

I'm making the circuit attached, can anyone help me with what resistor value (marked by "?"). What value will need when I connect 2 UV LEDs into the circuit. The pack says LEDs are 3.1V. Any help would be greatly appreciated...

 I have a small model battery charger which has a resistor burnt out . output is 7.5  volts  according to the label which sounds right as pack is 7.4volts.  measured voltage from transformer  is 15 volts Can anyone tel me what value resistor I need to drop the  voltage  to 7,5 v or whatever the actual out put shoul be. thanks people, john mantova

Is there a way to find the wattage rating of resistors and such mathematically? or is it something that has to be tested in real life? I have quite a few resistors that I'd like to use, but don't know the wattage rating of them. I only know their resistance, and I could calculate other values if I put voltage across them with a multimeter.  Also, what type of variable resistor would you recommend to control a 12 VDC device that draws 12 amps?

Hi, I ordered a kit of assorted resistors (112 types, 10 of each), and it's awesome, however, some resistors are marked weirdly, like 1k8, 2k7, 1m8, 2m2, there's quite a few. What's the meaning of these?

What would be a good Ohmed resistor for an LED running on a 3V power source? 3.2-3.4V typ with a 3.8V max.

Hey. I'm changing all the LEDs in the switches in the car. All is going well except one switch, there is 1mm distance between a circuit board and the LED. The LEDs are 12v no resistors. I'm using ultrabright red LEDs that need resistors. However, I'm sure I've seen circuits that resistors go on the negative and positive leg before the LED. Would this work or would the LED still blow? Thanks.

I know i need resistors for leds, i know how to calculate what i need, etc. etc. but what im wondering about is why. why arent leds like glowing bulbs, what makes the difference in needing the resistor. also, why cant 1 resistor take care for multiple leds at the same time? please, if ur answering my questions, make it understandable english. im not comfortable enough in the world of science to understand that kinda stuff... (otherwise i wouldnt be asking these questions :D )

Hey :)Does anyone know how to power an oven resistor ? Is it really a simple resistor (I'm not sure as it is directly exposed in oven, it seems too dangerous for the user if it is simply a metal stick) ? If I plug it to 220V sine 50Hz will it heat ? Thanks :)

Can anyone help me I'm not very good with electrics but I would like to know how to find out what type of resistor I would need to run power from my ps3 power supply to the fan... If I wire it straight it's running way to fast and would like to set it to a lower speed. I have used a 220k potentiometer in the past but dont want to have to adjust it plus they are to bulky is heir a certain kind I should b looking at??

 Hey I want to make a touch pad that if touch in a certain area will change the resistance level and hold this even after not being touched....how would I do this???

Can someone tell me what a biasing resistor is, and where I can het some? Thank you in advance.

I'm a beginner in understanding electronics so please bare with me. :) what kind of resistor should I use in lighting 4 LED's with 9 volts battery? I really need your answers. :) Thanks in advance :)

So I see a lot of projects with like 60 LEDs of the same type or something like that, and they use a separate resistor for each LED. Why do they do this? Why not just get one resistor and hook it up to ground or VCC? Please explain, thanks!

Hello.  I bought some Christmas LED replacement bulbs but they have no specs with them.  I decided to wire one up.   I figured I would go with 1 . 5 volts at 7 1/2 mA.   Using a 9 volt battery, I have a 1K ohm resistor.   9 - 1.5 = 7/ .0075.  My problem is, when I put my meter on it, the one side of the resistor is showing 9 volts, correct, but the other side is showing 3.5 volts.   Shouldn't it only be reading 1.5 volts?  What is wrong?  *I've had the LED lit up for over 25 minutes so far and it hasnt burned out yet. Thank You. EDIT:   I just added  a 10K resistor, so now I have 11K (in series), yet I am still getting a reading of 3.5 volts.   I'm missing something here. lol   I'm also getting a reading of about 9mA with 1K and 11K ohms.   I'm lost.

In the circuit diagram(which I've uploaded),I intent to use a NPN transistor(BC 547) as a relay.The 9 VDC is stepped down to 5 VDC by a LM7805 and should be the trigger to the transistor,completing a circuit which needs the 9 VDC.The Collector is given the common negative of both the voltages and the trigger gets the positive 5VDC.I need a bit help to calculate R1 and R2.I had used two random resistors previously but the Load got powered by the 9 VDC even before the trigger was applied to the transistor.I figured out that the problem might be related to the resistors used. (I haven't included the caps used at the terminals of the regulator in the schematic)

Http://img86.imageshack.us/my.php?image=picture433pb4.jpgI ripped this out of a car audio system, i don't know the input volts, or whats what. I use to have it connected to a 3V battery to change a LED from 0 to 3V. Well, i pulled it out, wires gone. resolder wires as you can see. problem: WHAT IS WHAT?! All i know by the labels is it says RED on the lowest rail. the rest, dont know. If someone can please help me id love that. It switches on/off as well as changes volts. so i need 4 wires connected.

I know how to calculate resistive losses, but do different types of resistors have different amounts of losses (power in vs power-out, in watts) From my own observations, connecting a 10 ohm resistor across a barrey will cause significant heating in both the resistor and battery, and cause the wires to get warm. All of this is resistive loss, but when I exchange the resistor for a 10k resistor, there is virtually no heating at all. What if I use a 0 ohm resistor (direct short). The only thing getting hot would be the power supply, due to internal resistance. Does this mean higher resistance is less lossy and by definition, more efficient, or is this simply due to the fact that there is less current flow, and less power loss, and efficiency (% of power loss)  With an ideal constant current source, will the losses though any resistive load be equal? ( X amount of watts lost/dissipated @ 1A) Is it possible to limit current like a resistor without losses? (I know PWM techniques are more efficient, but I want actual resistance rather than chopping current flow and filtering with an inductor/capacitor RC filter)

Is there any way to calculate the voltage drop of a resistor value? For example, if I had a 47 ohm resistor, would its voltage drop equal -30V, -857358V, or -0.5V?

I found this schematic from Make Magazine and it gave in my eyes a vague description of a certain Resistor. They label it as a variable resistor, but I've narrowed it down to it probably being some sort of knob that turns. I was just wondering if http://www.taydaelectronics.com/servlet/the-1874/47K-Trimmer-Trim-Pot/Detail is the right resistor? Any help would be great!   Here is the page for the 'Lie Detector'. http://www.apogeekits.com/lie_detector.htm To be honest this is my first ever schematic into circuit I have ever done, and I have done a lot of research. Hope it goes well.

I need some help organizing resistor. i have a ton of resistors but have no idea how to organize them. any ideas?

Topic name is pretty much self explanatory. What is tolerance in resistors?

Hello, I have a quick question about resistors and LEDs. If I am making an LED flashlight, do I attach the resistor to the (-) side or the (+) side? Thanks!

I wanted to know why the resistors were used on the Bluetooth speaker and if I need them,  what size are they? 

I am relatively new to electronic projects building and I have noted that some projects do not state the power and tolerance of the resistors. How should I proceed, are there any guide lines to establish the tolerance and wattage? Thatnks.

 I am designing a led array consisting of 17 leds in parallel using 4.5 volt power supply.The led calculator is telling me to use 62 ohm resistor on each - leg of the LEDscould I just use one 62 ohm resistor right after the power supply? Or maybe like 1 or 2 100 ohm resistors? I'm using blue leds 3.3 max voltage 20 Ma

 Hi, I got a bunch of resistors with my LED order, and I'm having a hard time with the colors on this set. The picture actually shows it clearer than I can tell with my eyes. So what is your verdict of them? 70?

I'm making diode bridges to have a nice supply of DC. I'm making a high voltage bridge for a 7.5kv nst and a low voltage bridge for regular 120v wall outlet . My high voltage bridge im going to make with several 1N4007 but i read that they should be "shunted" with 10Mohm resistors im not sure what is meant by this. Does it mean resistor, diode, resistor, diode or does it mean diode and resistor, diode and resistor. The pic says it better than i do.  Also, do i need resistors for a bridge for 120v bridge?, im going to use the diodes from a fluorescent light power supply.

I have am writing an arduino sketch for a mini traffic light projects that will require both 220Ω & 330Ω resistors, I ordered them, the problem is that the resistors I received don't add up when looking at the bands. this is the color band  ORANGE+ORANGE+BLACK+ORANGE+BROWN 3 -------------3------------0----------x3------------1%-------- does not this mean 330 x 3 @ 1% so the 330 is actually 3,300 or would it be 330kΩ It's been years since I've looked up color bands , can I even use these ones for simple 5v led projects or should I just re-order the 330Ω resistors now? thanks in advance robert  

I posted a very similar topic a couple minutes ago but I'm pretty sure noone can see it, so I'm copying and pasting the body. I just want to check this before I blow up my mosfet (I've never used mosfets before) Is it correct that you don't have a resistor from the voltage source to the gate (unlike bipolar transistors) Should or shouldn't you have a 1M ohm from gate to ground? Let's say I'm driving a mosfet from a 555, should I have a resistor from the output pin to gate? I think the schematic I'm reading just through a mosfet in where a bipolar use to be without changing that resistor.