How Breadboards Work



in electrical engineering we use several devices to connect our circuits together to the devices we use are shown right here one is called a breadboard there is no bread involved though but it is it's a boards made out of plastic and the other is called a PC or printed circuit board they these two look a lot alike in fact they're labeled just the same and their connections are the same and the idea today is – or right now is to show you how these connections work if I flip the printed circuit board over at one sides plastic that's where the parts go on the other side is where one solder because this is the metal side and you can see the different lines here that connect the holes we've got better not hold it we've got holes here and these are all connected together and we've got holes here that are all connected together and each row is connected but these are as over on this side aren't connected over here you can see the gaps between them so these five holes are connected together the next five are connected together but they're not connected to each other the same is true over here on the breadboard these five holes are connected the next five are connected the next five are connected but no row is connected to the row next to it this whole long side are connected together these things are called nodes where we've got things all connected together that's called a node so this first one is a node this is a node the second one's a node that's a node this whole long line here that's one big long node we call those buses because they're so long long train of holes there it's called a bus so when we want to make a connection we stick the ends of the elements into the holes and they'll go into the holes and stay there and that's how we connect things together if we want to connect two things together they have to have a node in common let's take a look at two resistors I can put a resistor connected here at the very top and connect the other leg down here well that's not connected to anything because there's nothing else to connect to to so I take another resistor and I put it someplace else on the breadboard it fits right into the holes very nicely now are they connected no because they don't have any of their nodes in common to be connected they have to be connected at two nodes or at least one node anyway so if I come here and I put this here and then put this other leg down here now I've got a connection current would go through this resistor follow the node and go through that resistor so now they are connected together if I miss by one node or by one row here which essentially is one node C now this row and this row they're two different rows so they're not connected they don't make a connection and we can't see that that doesn't show up too well I don't think but there's no connection that we can show this a little bit easier if we use lights I'm going to use a battery I'll connect this red to this whole long node here on the side and that makes this all one no that means all this is positive and then I'm going to make this node over here my ground or my negative so that means anything I put into this long note over on this side will connect to the negative side of my battery anything that I connect to the red side over here connects to the positive side of my battery so if I wanted to light up a light bulb let me bring our light bulb over here in order to make the light light I have to go from a positive so I'll connect this to my positive I have to connect that to my negative and now I've got a circuit the currents flowing through the positive through my light bulb back around and in and I've got this connected to my battery that's how we make a connection well suppose I wanted to add something else to the circuit like another light bulb so I can bring in another light bulb and if I stick it anyplace else in my circuit while I want to connect it here and here well that's great but it doesn't connect in my power at all so it's not connected it doesn't connect to my positive it doesn't connect my negative okay so let me undo this light bulb and say I want it to connect to the one end of my other light bulb so now I've got my positive here going through my light bulb coming back to here and I'm going to go through my second light bulb and follow it around and I'll have to have it come over here to my negative so now I've connected my two lightbulbs here at this one node and I've got electricity flowing through both lightbulbs and they both light up and that's how we can make a connection in our breadboards if we do anything to break the connection I take this out they go out put it back in they come on and again if I miss it by one row I've missed it they're not connected together the two rows aren't connected so it doesn't light I have to make sure I'm in this right spot and then they'll light up what happens let me get rid of some of the connections now go back to my one little light bulb here's my one little light bulb suppose I connect back to I come through here go through here and I connect right back to here again well I've connected the light bulb to itself so the current can't flow through it and there's no connection so it doesn't light up so if you connect something to itself in the same node nothing happens it doesn't use up any electricity and it doesn't come on occasionally we have other weird devices like this little black thing here it's got a whole bunch of little legs to it and if we want to make a connection for it it's best to put it right here between the gap on the bread boards so that each leg has its own node and then we can connect it to other things and that works out really nice if I put it instead of there if I put it here then I've got two of the legs connecting because two of the legs are on each row and that's not something I want to do I want each to have its own node this that was called an IC integrated circuit this is a variable resistor and it's got three legs and again we don't want the three legs to be on one node so we don't want to turn it and have two legs on one node we want to turn it so that each wire goes into a different node and then we've got places to connect the variable resistor to other things in our circuit so you need to be very careful when you're hooking things up again remember that each of the rows there is one node one node and it's not connected to anything else we have different types of breadboards here's a second type here it's just the same as this first one except instead of one row it's got two rows here two bus lines one blue and one red we usually make the Reds positive the Blues negative and this just has two extra belong nodes on each side no problem with that otherwise it's the same another type of bread board will have connectors on the side so that you can actually connect it to other equipment and then you can unscrew these and you put a connector from here over to the breadboard and you can make the long bus lines positive or negative or whatever you want to do with those this one's a little weird in that these are connected down to this brake line and then these are not connected to the ones below it so instead of one long bus line we have four bus lines but they're each a little bit shorter than the other type of breadboard so you need to be careful with those two just make sure where all the connections are and that's basically how breadboard works hopefully now you can go into the lab and hook up your bread boards and use them and hook them up so that you make all the correct connections huh you're right Denise it wasn't as easy as I remember it doing

41 thoughts on “How Breadboards Work

  1. Thank you so much my friends in robotics club were trying to explain this to me and I was having so much trouble but your comparison to the printed circuit board helped me to understand.

  2. Great video. I hope you are a teacher because you have a way of making it interesting and easy to listen to

  3. madam your video is awesome. but i have one single doubt.  when u r able to explain the concept in such a superb way, then y did u stop with only just one video? i request you to make more videos and help people like me. thank u so much

  4. This is great, I'm starting to want to build little projects and this helps! (LOL @ 9:32 to end 🙂 )

  5. Thank you so much! After paying $30K for a technical school on Electrical Engineering, this is the first time that this makes sense. I wish I would have gone to your school instead. Hard lesson learned. Simple explanation. Wow!

  6. sometimes, after a long and lonely friday afternoon, i like to come home, get into the bathtub and cover my body in hundreds of bread boards while listening to the soothing voice of our professor explaining how to use them properly.

  7. lol as I was watching I realized this video was every thing i was looking for and I kept reminding myself I needed to say thanks after watching but I can see every one else had the same idea. but any way thank you this video was very helpful. the only thing I don't understand is what are the black and blue things for?, connecting 3 rows together ?

  8. It's probably been said a dozen times, but I feel it must be iterated again "thank you very much", if that sounds too watered down from the amount of times it's been said… Thank you kindly then! Hahaha

  9. @tyler9613
    Almost but not exactly.
    Say you have two equal resistors in parallel and you add another. You will not half the resistance again, but you will only reduce it to 3/4. Same in series.

  10. oohhhhhhh ! gotcha tyler9613 ! thanks ! so in series the resistance grows down the line ? and in parallel the resistance is evenly distributed?

  11. Great video ! Very informative , being that I am a noob, like the ending. 1 question whats in the bread board that connects everything. Or how does power flow through the board, is it wired on the inside? Thanks

  12. ace job denise ! how come the one lamp was dimmer than the other one ? nice video ! SUBSCRI—BEeeeeeee ! lol

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