John is 1.8 meters (6 feet) tall. And in this email I'm going to put him into a hole to show you what negative voltage means. But first, what does it mean that John is 1.8 m tall? Could you find his height by only looking at his head? No. You have to compare the top of his head to the ground he is standing on to be able to find his height. That John is 1.8 m tall really means that the top of his head is 1.8 m higher than the ground that he stands on. It's the same thing with voltage. You can't say anything about the voltage without comparing it to another point. It's common to define a zero point, or "ground", in a circuit. In a simple battery circuit, the ground point is usually the minus terminal of the battery. So if someone says that "this point is 5V", they usually mean it's 5V compared to ground. What is a negative voltage? Back to John. What if we dig a hole of 1.8 meters, then put John into the hole. (Poo...
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