So, besides AC, or alternating current, and DC, or direct current, there are other specifications that will help define the electricity your dealing with. What's the currents pressure? What's it's volume? Whatever circuit you're dealing with, you need to know these things.
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Voltage (volt) is current's pressure and amperage (amp) is the current's volume. Another important variable to know is how much resistance the current is encountering and we use "ohms" to represent that. Now, take a look at the diagram to the right. We have a tank full of water with a spout at the bottom. The difference between the two is the resistance, or "ohms," which is another very important factor. Now, the amount of water is the "voltage," the width of the nozzle is the resistance, and the "amps" is a result of the resistance. Now, you need to know that more resistance = less flow and this diagram illustrates that. The thinner the nozzle the more resistance there is and that reduces the volume of water allowed out, or amperage. There's a really simple equation out there to calculate this and that would be Ohm's law. I = V/R where "I" is your amps, "V" is your current, and "R" is your resistance. This makes since because 1/1 = 1 and 1/2 = .5 proving the illustrations above are true.
Want more? Head on to lesson 3!
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