Here's two thing that I never understood.
In electronics, the focus is hugely on voltage. If for example, 5V is too much for a microcontroller, we convert it down to 3.3V.
BUT, that part confuses me. Voltages are just potential. They aren't anything physical or real. Current is what is real.
If you had 5V at 2A (which say would fry a device), and backing it down to 3.3V volts using lm317....what good would that do? The current is still going to fry the circuit (even though I know it doesn't but I don't get why). What happens to the current?
I just don't get how Voltage is relevant to whether circuits become fried or not. Why isn't it current?
Also, what is the difference between 5V, 500ma and 1V, 500ma. In terms of current, what happens to it? does it mean that the 500ma is processed differently whether you have 5V or 1V? Does the 5V current get less hindered than the 1V current?
Also, why is AC output only given as Voltage? Like 110V/220V. In DC we get something like 5V/500ma. But with AC, I can only find 100V/200V. No mention or even a question about where the current component went.
In electronics, the focus is hugely on voltage. If for example, 5V is too much for a microcontroller, we convert it down to 3.3V.
BUT, that part confuses me. Voltages are just potential. They aren't anything physical or real. Current is what is real.
If you had 5V at 2A (which say would fry a device), and backing it down to 3.3V volts using lm317....what good would that do? The current is still going to fry the circuit (even though I know it doesn't but I don't get why). What happens to the current?
I just don't get how Voltage is relevant to whether circuits become fried or not. Why isn't it current?
Also, what is the difference between 5V, 500ma and 1V, 500ma. In terms of current, what happens to it? does it mean that the 500ma is processed differently whether you have 5V or 1V? Does the 5V current get less hindered than the 1V current?
Also, why is AC output only given as Voltage? Like 110V/220V. In DC we get something like 5V/500ma. But with AC, I can only find 100V/200V. No mention or even a question about where the current component went.