Beginner Electronics

Beginner Electronics – 5 – Resistors

what is going on everyone my name is Gautam art and welcome back to episode 5 of electronics in this episode we are going to talk about a very important

electronics component that we are going to be using a lot and it is the resistor the resistor is very important and we are going to learn all about it now in the last video we talked about

resistance which is measured in ohms or you might see this symbol around somewhere and resistance is very important to have in a circuit and a resistor basically provides a circuit

with some amount of resistance it will actually resist the current however many ohms that resistor is going to provide and trust me if you don't understand all this we will learn all about it today

and later on in the video I'm actually going to show you a real resistor and we're going to work with it now why in the world do we really need resistance well let's say we have a battery here

and it has two terminals here at the top who cares what they are right now just know we have two wires here and these wires let's lead them up to a little light bulb and this light bulb is giving

off a bunch of light now we are going to do something similar to this in a couple of videos and this actually will not work in our case the battery in this case just imagine is providing a ton of

current to the light bulb and the light bulb can't handle it and this might actually burn out the light bulb and cause the light bulb to be not able to work instead we need to limit we need to

resist some of the current that way we don't overload the light bulb and it'll blow out so in this case we would add a little resistor into this wire right here and that will help resist some of

the current that way the light bulb can actually work don't worry we're going to get all into this in a little bit so before we get started here I want to point out a few things so you might see

along your journey you may see something that says one ohm and that means one ohm but you might also see something that says 1k ohm this stands for one kilo ohm and that's actually equivalent to 1000

ohms you may also see something called 1m ohm and this stands for one mega ohm and that really means 1 million ohms and I spell that completely wrong 1 million I just wanted to point this out these

are just three different units you have ohms which are regular what you're going to use in equations and all that then there's one kilo ohm that really just means one thousand ohms then you have

mega ohms that really means million ohms so you could have say two mega ohms that's two million ohms maybe you have 20 kilo ohms that's 20,000 ohms just something I thought I should point out

there are multiple types of resistors but the most common one that you'll see and hopefully the ones that you're going to be getting look a little bit like this and I'll show you one later on but

basically it's a little component it has two wires coming out the ends and it has a little body here this is a resistor except how in the world do we know if this resistor is a 10 ohm resistor or

maybe a 1 kilo ohm resistor or a 1000 ohm resistor how do we know what this resistor is going to provide to us well these resistors actually have little color bands on them so say this

resistor has a brown color band then say it has two black color bands like so and then say it has a red color band at the end here these color bands will actually tell us how many owns of resistance this

resistor will provide for our circuit I know that this color band arrangement means this resistor will resist 10 ohms of resistance now how in the world do I know that well I didn't memorize it I

actually have a very handy chart over here you can get this chart on my website I recommend that you print it out or save it somewhere that you can access easily because this chart is very

important you're going to be using it a lot and I'm going to teach you how to use it basically we are going to look at the very first color band in our case it's a brown color band so on the chart

you're going to go over to the first column and we're going to see under Brown is the number one so we're just going to write down the number one here the second color band is black so we're

going to go under the second column here go under black which is zero so we're going to put one zero like so then the third color band is also black so we're going to look under black and we're

going to go under the multiplier the third color band is called the multiplier band in our case black which is our third band is a multi player of one and that basically means

take the number that you already have in our case is ten and multiply it by one this will give you your final visit resistance value in our case 10 times 1 is 10 or 10 ohms like so now what is

this red band for well the red band or the last band whatever color it is is called your tolerance if we look under the chart here red has a plus or minus 2 percent tolerance now don't worry about

the tolerance that much we really don't care about it tolerance is basically how accurate is this resistor plus or minus 2 percent tolerance means this resistor in our case might be 10 ohms but it

could be a little bit under 10 ohms or it could be a little bit over 10 ohms it's not going to be exact but if we had a tolerance of say a gray color band so plus or minus point zero five percent

that is an extremely accurate resistor that resistor is going to be as close to the rated value as possible it's not going to vary that much for the things that we are going to be using resistors

for it's okay if you have a gold band plus or minus 5% that's plenty even silver might work for a lot of the things that we're doing so tolerance is basically how accurate is a resistor we

don't really care about that right now we just care about the first second and multiplier bands so let's try a different example here say we have a resistor that has a red band and we'll

do a black band so we have a red band a black band and we'll have a green band here as well and we'll have another green band at the end here so this is our resistor how many ohms is this

resistor going to provide us try and figure it out yourself right now well if we take a look our first band is a red band so under the first column red is two so we're going to write down the

number two the second band is black if we look under the second column under black we have zero so 20 then our third band is green and remember the third band is the multiplier grant band so

under green we have to multiply this by 100,000 so 20 times 100,000 and that is going to get us our final resistance value in this case 20 times 100,000 is I believe

two million ohms you could also write this as 2m ohms two megaohms like we talked about in the video in the beginning of the video and of course this resistor has a tolerance because we

have another green band of plus or minus 0.5 percent so it's a fairly accurate resistor that's pretty good but we don't really care about the tolerance who cares to put that so hopefully you know

how to find the value or the resistance value the own value of a resistor now let's actually take a look at an actual resistor okay so here we have two actual resistors here we have a 1 kilo ohm

resistor at 5% tolerance because we have a gold band at the end and the bottom resistor here we have a 7 v point 1 kilo ohm or a 75 thousand one hundred ohm resistor at 1% tolerance notice how the

bottom resistor is different than the example it actually has five bands on it it's kind of hard to see but the first band on there is purple green black red and then brown this means you just take

the purple green and black ones and do the digits first then the red band would be the multiplier and of course Brown is still the tolerance level the top resistor here is almost the same as the

examples it only has four bands so you can just follow the examples with that one get used to seeing these resistors because we're going to be using them a lot thanks for watching everyone and

I'll see you guys in the next video

We learn all about actual resistors and ohms!

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