# Beginner Electronics - Beginner Electronics – 16 – Clarify & Power / Wattage

## Beginner Electronics

29 Lessons

### Beginner Electronics – 16 – Clarify & Power / Wattage

what is going on everyone my name is Cody Moore and welcome back to electronics episode 16 in this episode we are going to clarify a couple of

things and then talk about what power slash wattages first things first remember I am only a hobbyist when it comes to electronics and I'm by no means a professional at electronics that means

that I'm almost guaranteed to make a few mistakes within this series so if you see any mistakes in any of my videos be sure to comment them down below especially if those mistakes have to do

with safety because I want everyone to be as safe as possible with that being said however I am NOT responsible for anything that you do following along with this series so you are at your own

risk when you perform any of these electronics experiments I'm not responsible for any of that alright now let me clarify a couple of things that many people have questions on first

things first some people ask which side of the circuit should you put a switch on so in this circuit I just have a resistor and an LED here some people ask should the

switch be placed closer to the positive terminal of the battery or should the switch be placed closer to the negative terminal of the battery now it'll work the exact same both ways however many

people use the convention of placing the switch closer to the positive terminal of the battery so I'm going to try and do this from now on within this series due to convention and

many people say that it is a bit safer just by the fact of how what Tron's move I'm not going to go into any of those details in this video you can look that up on your own if you're interested but

that will be the convention that I'm going to be using in this series the next thing that I'm going to kind of clear up for you guys is which way does electricity flow in a DC circuit there

have been many many arguments on this in the comments and I'm just going to clear it up a little bit now when I'm talking about this I'm talking about through a DC direct current battery under fairly

normal circumstances alright now electricity is really the flow of electrons that means physically electrons are moving from the negative terminal of the battery to the positive

terminal in that direction that is the physical movement of electrons that's it that's the science of electrons moving in a battery of course there are some situations that might change these but

in general that is the movement of electrons however you'll notice that schematic symbols and many articles that you might read online as soon or show that electricity travels from

positive to negative and you'll see that a lot in schematic symbols and that's because schematics and many articles use conventional electricity flow conventional and convention shows that

electricity travels from positive to negative and this is just because years ago when this type of work was first being done it was believed that electricity traveled positive to

negative therefore all the schematic symbols and many articles are written that way and this still works because if you know anything about science which it's okay if you don't electrons are

negatively charged and are attracted to a more positively charged surface that's why they move towards the positive terminal however at the same time it can be thought of as all these molecules

losing electrons kind of in this direction and that's why everything still works again I'm not going to get too much into the nitty-gritty details of course you can do more research on

this by yourself finally to clear up is multimeter common-sense this goes along with safety I didn't show you guys to shoved your multimeter in a wall outlet therefore if you're going to go do that

do tons and tons of research so that you do that properly as I never taught you guys how to do that so be safe when you're working with electricity guys and finally like I've said before I'm not

responsible for anything you guys do using the information in this series alright enough of the safety talk let's get on to power slash wattage first things first what is power so power is

essentially the rate of energy usage we'll keep it simple power is the rate of work being done or like I said the rate of energy usage will keep it that simple right now but what about wattage

or watts watts is simply a unit of measure of power so watts is just a unit to measure power up here and watts is often symbolized by the letter W while power is often symbolized by the letter

P now you've likely seen power before if you go to the store to buy a light bulb many light bulbs have wattage ratings so you might buy a light bulb that's a hundred watts meaning that it's going to

take up more work than maybe a 90 watt light bulb or take a more energy rather so a general rule of thumb is the more wattage something has the more energy is consumed by that

device now let's talk about things that we've used so far in this series well we've used resistors and resistors actually have wattage ratings most commonly and probably the ones that you

have are quarter watt rated resistors so essentially this means that your resistor can handle up to 1/4 or 0.25 watts going through it without hurting itself too too badly now there's many

other different wattage ratings for resistors such as 1/8 watt which is a little bit less of a rating or 1/2 Y or a full watt even and they go higher than that but for our purposes quarter watt

resistors even eighth watt resistors are probably plenty for the work that we are going to be doing now unfortunately I don't know any way of figuring out the wattage rating of a resistor if it's

unknown but a general rule of thumb is the larger the resistor the higher the wattage rating chances are your resistors are going to handle this series just fine and are probably either

eighth or quarter watt resistors all right this is probably not making too too much sense let's just get into some simple equations so we can see the relationship a bit better power equals

voltage times current and of course from this we can get voltage equals power over current and current equals power over voltage as well but this is kind of the main formula for power and remember

power in our case is just going to be measured in watts so watts equals voltage times current let me get into an example and maybe it'll be a bit more understandable because I'm confusing

myself right now we're going to say that in our first ever example I did with LEDs my LED was going to take three point two volts from our power supply at 24 milliamps and remember 24 milliamps

is just point zero to four amps so that was the voltage and current that my LED would use so let's find out how much power that my LED was using we know that power is going to equal our voltage

times our current which is going to equal three point two multiplied by our point zero two four amps which is going to equal zero point zero Oh seven six eight watts so the power

that my LED was using is point zero seven six eight watts that is essentially the amount of energy that LED was using and we could do the same or similar rather calculation for the

resistor that we used in that circuit as well because remember power is just a unit of work or how much energy is being used so I'm gonna fully admit to you guys right now that if I was watching

this for the first time this probably would make zero sense to me so if you don't fully understand the point of power don't worry about it at all we're not going to use it that much

especially in the beginning this series here I just wanted to get wattage out of the way in case you ever see wattage or wanted to do a bit more research on your own about it and it's a good thing to

keep in mind that wattage is simply how much energy is being used by a certain component and it can be useful to calculate this for certain devices that way you can make sure that you're not

having too high of a wattage and using too much electricity there's much more to wattage guys if you're interested go ahead and look it up in yourself and I will have videos on this in the far

future I just wanted to get this out of the way thanks a lot guys for watching and I'll see you guys in the next video where we're going to talk about series and parallel circuits

I clarify some common questions and we go over the basics of Power/Wattage!

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