# Beginner Electronics - Beginner Electronics – 3 – Closed/Open Circuits

## Beginner Electronics

29 Lessons

### Beginner Electronics – 3 – Closed/Open Circuits

what's going on everyone my name is Kota Martin welcome back to electronics episode 3 in this episode we are going to talk a little bit about electronic

circuits now in the last tutorial we talked about direct current or DC current and we said that DC current comes most often from batteries so here is my battery it's a really bad drawing

but if you go out and you look at a battery right now most likely you're going to see a little minus sign on one end of the battery and a plus sign on the other end of the battery now the

minus sign basically indicates that that side of the battery that piece of metal towards the end of the battery is called the negative terminal and the plus sign says that that side is the positive

terminal of the battery and a terminal is basically where the electricity will flow from in a battery so here's my bad picture of a battery this end here is the negative terminal this end here is

the positive terminal so in order to create a circuit or create something that this battery will power we have to connect the negative and positive terminals to whatever we want to power

so I'm going to draw a wire from the negative terminal here here's a wire and I'm just going to draw a wire there and then I'm also going to draw a wire from the positive terminal and draw a wire

down here now say I want to power a light bulb so here's my really bad drawing of a light bulb yeah that's a light bulb I'll write it underneath light alright so I want this light bulb

to light up and the battery is going to power that now right now this is not going to work the light bulb is not going to light up and that is because the light bulb only has one wire

connected to it it's connected to the negative terminal by a wire in this doesn't work because in order for a circuit to work off of a battery the negative terminal must have some type of

path to the positive terminal it needs to connect to the positive terminal in order to make electricity or to make the actual light bulb turn on this is called an open circuit and it's called an open

circuit because there is a huge gap in between here part of the wire isn't connected and open circuits do not work basically there's no power going through these wires at all so in order to make

this light bulb light up and to make this circuit work what we're going to have to do is we are going to have to connect the negative terminal to the positive terminal somehow and to do

that we're just going to connect the positive terminal wire tip a light bulb as well and this will effectively light up the light bulb because if we take a look electricity will flow from this

negative terminal through the wire here they'll throw flow through it it'll go through the light bulb and then it's going to continue on this wire up to the positive terminal and that is called a

closed circuit it's going to work because the two terminals are connected by this wire in lightbulb path therefore the light bulb will light up so what I really wanted you guys to get today was

what a closed circuit is a closed circuit versus an open circuit so an open circuit has a gap in it and it will not work a closed circuit basically means both of the terminals of the

battery are connected in some type of way and it will work it's powered so this was a pretty simple video basically we learned about the two terminals of the battery closed and open circuits now

we must move on to a bit more of an advanced topic and that's the actual electricity itself thanks for watching everyone and I'll see you guys on the next episode

We learn about closed and open circuits, and batteries!

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