So a complete circuit. So let's try it. If I can do this. So a symbol for our battery. There we go. We have the technology. And here's a symbol for a resistor. Then if I put a switch in here, which would be like that, this is a complete circuit, but this is open. And so when I close this switch, now I have a closed circuit. Now I have a complete path for a current. So if the current would flow from the negative side of the battery through the resistor. Now I'm going to be repeating this term. This is called polarizing resistor. So this would be negative to positive as it goes through. There would be a voltage drop across there. So that's where I put my voltmeter across here. If I put my voltmeter, which is a symbol, would be like this with a V in it. That would be the voltage drop. So I'd have a negative deposit of voltage drop across that resistor. It would come through the switch. And it would come back over here. So the imbalance, there would be a negative deposit of charge here. The current would flow from the negative, I have excess of electrons on this plate. Those electrons will go through the circuit. This I was talking about like your car stereo through this ignition switch. Back through and try to balance out the imbalance in this battery. And when this, all these electrons come over here and fill all these lack of electrons over here. You have a dead battery. If I was to put an amp meter in here, the symbol for that would be like this. So the voltmeter, this is called going in parallel. I'm going across the resistor. Here, the current has to go through the battery. Or it should be the amp meter. And they put an A in here for amp to put a V in the circle here for voltage. And that would be negative positive. These are polarity sensitive. If you put the digital voltmeter up here, which is student proof, it'll come up and say, oh, you have a negative one amp. What happens is it means that your leads are backwards. You know, they say that it's a negative in here. If in the Simpson's, the black volt oh milliamp meter, you put that in backwards. The needle will try to go past zero and you'll bend your needle. And forever more people will laugh at you because you have a bit needle.