Which resistors to buy

These components include passive components like resistors, capacitors, inductors etc. This Passive devices or components do not generate energy but can store it or dissipate it. Passive devices are the main components used in electronics which together are required to build any electrical or electronic circuit.

Passive devices can be used individually or connected together within a circuit, either in a series or in a parallel combination to control complex circuits or signals. Whatever the reason for their need, it is important to buy the right resistors and also for a good price. Also the source of supply or electronic components distributor can be important in some applications.

Accordingly, knowing where to buy resistors and also how best to buy them can present a challenge. As with any decision, when buying resistors there are several issues to balance: cost, which electronics components distributor, quality, original manufacturer, and much more.

One of the crucial element of buying resistors is to choose the correct resistor. There are several types of resistor, each with their own advantages and disadvantages:. Carbon composition: These resistors are seldom used these days. They find two main uses: the first is for the restoration and repair of vintage radios where they were initially used: secondly carbon composition resistors are ideal for circuits where they need to absorb high transients.

As carbon composition resistors have a relatively large bulk, they can absorb high transients for short periods and they are used in applications where these transients need to be accommodated.

As a result it is still possible to buy these electronic components. However, for normal use these resistors are bulky, they have a tendency to vary in value and they generate considerable amounts of noise.

Metal film: Metal film resistors are the standard leaded format that is used these days. A variety of values and wattages are available. Closer tolerance varieties are available. They are widely available as leaded components, and the same technology is used in surface mount devices as well. Wire wound resistors : Wire wound resistors are typically used where higher power limits are required.

Types are available that can be bolted to a chassis or heat sink to remove the heat. Sometimes they may also be used for very close tolerance applications in measuring instruments as they can be very closely trimmed to provide the required resistance, and they are also very stable. When buying resistors it is necessary to closely specify the required resistor. So, i was wondering what do you think about what Ohms values of resistors do i need most during simple projects.

By simple , i mean you use lot of LED, sensors and stuff that can be found in Starter kits. I wanna stock up some resistors of different values and i need to decide what values do i need most?

I am not going to solder in near future so i would buy of most required value just to have it around. When i start to learn how to solder and stuff, i will buy more. Or should i buy every possible value there is, because they are cheap and figure out in future what i need.

But there are around values in my shop and buying 20 of each would cost me 30e. I am not kind of person that is willing to take a walk to nearest shop which is 20 mins by bus every time when i need something and that thing costs pennies.

So what is your experience? Boy this is an opinion question if there ever was one. For the larger selection I would purchase a Kit on ebay. I don't have one in mind but I've seen them there. When you are starting out, the plethora of resistance values will seem extreme.

Like, who would ever need a 90K resistor!? So start with just a few and combine them to get different values. Once you get the feel for what you need, get those.

I would start with some , , resistors. These will work with most simple Arduino projects. You can get double the resistance by putting two in series, or half by paralleling them. Here I would choose a mW resistor since those are the most standard ones.

So why all these different types of resistors that I mentioned before? Because for some circuits the actual type of resistor also matters. These circuits include:. Which resistor type to choose for which application is beyond the scope of this article. If you are building any of these types of circuits, see if the schematics specify the resistor type.

If not, maybe this article can help you out. All you need to worry about is the resistance value and how much power it can take. If it fails after a short while, you should exchange it for a higher wattage rating. Maybe you should even take the effort to calculate a decent value ;. Waiting your response. Thanking you.

Why did you go with power dissipation on the first page when we first have to find ohms? Other than that this article helps a lot. Hello Tomoslav,I would like to try answer your question. The reason as to why we went to power desipation rather than finding out the resistance needed is, The guiding point of the value of resistance needed is the end point consumption… LED, My point is, power which must go through the resistance so that the LED can come ON is the division of the squared voltage and Resistance.

Also, if you were to decide on the LED to use having resistance,,,all same. Typically the resistor networks are a package of resistors where one end of each resistor is connected to a common lead, and the other ends are all separate. A resistor network is especially handy when building an audio mixer, for example, because each input typically has both a potentiometer to adjust level and a fixed resistor for isolation, or to set a maximum input, I guess for each input.

Using resistor networks in cases like these simplifies wiring for both breadboards and prototype printed circuit boards, and reduces assembly time even for custom PC boards. It is how much power that is lost from the circuit at that component. Usually in the form of heat.

The water battery makes 1. So my question is what resistor should I use. My second question is do you know whether voltage drop is the problem because the circuit worked earlier during testing.

The article is fantastic but you did not explain as to how 47ooo ohms converted into kilo ohm Dividing the figure by but what about wattage of 0. Any how a great contribution.