Having read your responses to a number of posts, I just have to jump in here again. To say you are comparing Apples to Oranges is an understatement. You seem to be more comparing bricks to bananas. The question of "volts vs amps" is actually asking two entirely
unrelated questions. It sounds like you need to learn a little more about electricity. I don't have room(books) here, or time(months) to teach electricity. A good(?) starting point is at:
Just an introduction though, even the listed books just give an overview. Electricity is a deep subject. I am (used to be) an electrical engineer. Yet I only have a passing knowledge of electronics. The freehanded availability of electronic components is a little misleading. Remember Robert Heinlein's books, TANSTAAFL, there ain't no such thing as a free lunch.
VOLTS: Think of pressure. In the old days, it actually was referred to as pressure. Compare a garden hose to a fire hose. they both have the same pressure, the city fire main. Excluding houses with a pressure regulator, of course.
AMPS: Think of those hoses again. The fire hose can deliver a hundred times more water in the same time as a garden hose. And is much more difficult to handle. Look at the size of the two relative to each other.
WATTS: The amount of work that
can be done. A garden hose can spin up a small fan. A fire hose can push a car down the street. Same pressure, remember. . . Think about how difficult it is to handle a 3 inch hose compared to a 3/4 inch hose.
To consider volts, a microwave oven has a transformer that can deliver 3,500 volts for the Klystron. But only a few
thousandths of an amp. A car battery, on the other hand, is limited by the number of cells in that battery. It can only deliver 13.2 volts from full charge. But it can deliver several hundred amps for a few seconds. The two, volts and amps, cannot be compared. But they work together to produce watts.
Watts only apply in small devices when comparing name plates. What matters is amps and volts. Watts only matter in large items like motors, comparing output like watts VS horsepower.
To say you are competant in automotive electrical systems is to say you know how to change the fuse or install a radio. What about using an automotive alternator to get 120 volts 3 phase power?
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