# Beginner Electronics - Beginner Electronics – 4 – Flow + Resistance

## Beginner Electronics

29 Lessons

### Beginner Electronics – 4 – Flow + Resistance

what skull not everyone my name is Kota Moore and welcome back to electronics episode 4 in this episode we are going to talk about a few more advanced topics

and electricity so if you have trouble understanding what I'm talking about in this video that's completely ok watch the video again maybe look up a few articles online and if you still don't

fully understand everything that I've talked about in today's video that's fine just move on with the rest of the series and down the road once we begin working with this stuff a lot

you're gonna begin to understand it hopefully but hopefully I'm able to explain this stuff to get a basic understanding of the topics that we will be talking about so before we begin

today let's talk about electricity very very briefly here here is my big purple wire and we should all know that electricity is just the flow of electrons through say this wire so

electricity is really just the flow of electrons that's all electricity is in in the bit very basic understanding so electricity is the flow of electrons all right now there are many characteristics

to electricity that we can talk about many traits to it but they're kind of tricky to understand so what I'm gonna do is I'm going to explain everything using water so water whenever I say

water it's really gonna be our electrons think of electrons as being water flowing through wires or flowing through pipes you'll see what I mean so let's draw a tank of water up here at the top

alright so here is going to be my my tank alright and this tank is going to be full of water and you can kind of think of this pink of water as a battery in electricity so when you're thinking

about about electricity think of this tank of water as being kind of the battery re the source for our electricity or for our water in this water system so here is my tank of water

and this tank is going to have say a pipe coming down down from it like so so here's my pipe and of course gravity is going to push all this water down the pipe like so now if we take a look at

this system we can notice a few characteristics about it the first thing that we're gonna talk about is water pressure so obviously this water is going to be

flowing down this pipe and that's going to create pressure you all know what I'm talking about pressure now there is something very similar to water pressure when we talk

about electricity and it is called voltage voltage like so voltage is measured in something called volts and when we're looking at equations and stuff voltage will generally be this or

the letter V so we have voltage and that is simply if we look at our water system water pressure so the pressure of the of the electrons flown through the wire all right and it's essentially determined by

the the battery we can think of so voltage in this case is determined by our water tank up here it's the pressure of the electrons flowing through a wire that's what voltage is now there's

another thing when we talk about this there is something called or the rather if we talk about our water system first we have the flow rate of water so basically how much water is flowing

through this pipe how much of it that's what I'm gonna be calling the flow rate and there's something very similar to that when we talk about electricity how many electrons are being pushed through

the wire basically how much power are we getting to push through this wire so in our water system here how much water is flowing through the pipe the flow rate of it and in electricity how many

electrons are flowing through or are being pushed through the wire and what we call that is we call that let me get a color here we call that current current like so and current is measured

in something called amperes and peers and your generous generally see just the letter or the word amps for sure and the the symbol for current or amperes is generally the letter I know I know I'm

talking about this stuff fast I'm going to recap it all at the end so don't worry so current is the flow rate of water if we're looking at our water system or an electricity current is the

flow rate of our electrons how much current is being forced through a pipe so let's expand upon current a little bit more let me create a quick other water tank picture this as being the

same exact water tank that I drew right here to the left of this like so and this water tank is filled with the same amount of water so essentially we have this

named voltage all right the same water pressure that's going to be happening however this water is also going to be flowing down the pipe we know it's a big difference this pipe right here is much

smaller than this pipe right here that means less water is going to be traveling through this pipe compared to the bigger pipe right here now that means we have less current because less

water is going to be traveling through this pipe so we have less current in the system and we say well okay I understand that so current is less when we have a smaller pipe when we have a smaller pipe

compared to a bigger pipe like that but what do we relate this to in electricity because we can't exactly change the size of a wire in a circuit I mean you can't have a gigantic wire and a really small

wire well I guess you could but that really wouldn't change much so how do we compare the size of the pipe a big pipe and a small pipe to our electricity system no this right here what I'm just

about to talk about is what I really want you guys to get out of this tutorial this is very important when I'm gonna be talking about and this is what I really

want you guys to understand the size of our pipe in our water system can be related to something called resistance in our electricity circuit resistance this is really our main topic right here

in our resistance is measured in something called ohms and we're going to talk about this a lot more in the future so its measured in something called ohms you got probably gonna see the letter R

symbolize that or you're gonna actually see the ohm symbol which is kind of like a horseshoe but for right now we just want to talk about what is resistance well resistance is just like the width

of our pipes like a small pipe and a big pipe now resistance is caused by using different materials in our electronic circuits and we're gonna get into all of

this stuff and how it actually works together in electronics and a little bit in the next few tutorials but basically different materials that we use to trap make electricity travel through has

different resistance levels so a really really really high resistance a high is going to resist the electrons it's going to resist the electrons essentially meaning it's a smaller pipe

it's creating a smaller pipe for all the water or electrons to flow through whereas a very very very low resistance it's not going to resist the electrons very much therefore it's going to let

the electrons through just like having a bigger pipe thus creating a more current or more of a flurry of the electrons so let's do a quick recap of what we really should have taken from this tutorial we

have voltage and voltage is essentially kind of like water pressure or the pressure of electrons moving through a pipe that's not super super important right now then we have current measured

in amperes or amps and current is our flow rate it is the flow rate or how many of these electrons are being pushed through the wire or how much water's flowing through a pipe now obviously if

we have a really smaller pipe in our water system the voltage is gonna stay the same but we're gonna have less current less less water flowing and very similar in an electronic circuit if we

have that wire pipe thinner then we're gonna have less current and how do we make that little pipe in electronics thinner well we don't actually change the size of the wire necessarily we use

different materials that change the resistance of where the electricity is flowing through so a higher resistance is going to resist electrons more kind of making us a smaller pipe and creating

less current whereas a less resistance very little resistance is just going to let electrons flow through as normal giving a higher current so hopefully I made that fairly clear today and we're

gonna be talking about this stuff in many many tutorials hopefully I explained it good enough thank you all so much for watching and I'll see you guys in the next tutorial

We talk about some traits of electricity, such as voltage, current, and resistance.

See my website: https://codenmore.github.io/