I've been wracking my brain over this one for about a week now, trying to understand current, voltage, and resistance, and I'm still quite confused, despite all the LPF threads I read on the subject.
I understand current is amps, and voltage/resistance = current. I understand voltage to be similar to having a bunch of heavy weights pushing down on a balloon full of water, and the amount of water that comes out is the current. The size of the hole is the conductance, and that's the opposite of resistance or ohms, just like wavelength and frequency are inverse, the smaller the hole, the bigger the resistance.
A couple of things bother me though.
How can a battery have a measurement of current, or even voltage if the battery isn't hooked up to anything?
How do high tension power lines change voltage and go back to lower voltage to increase range? I thought you couldn't change voltage.
how does something "regulate" voltage?
If you know what the amps are, why does voltage even matter?
An finally, why didn't my little LED brightness change when I changed my potentiometer setting, but changing the battery size worked just fine? Did I line them up wrong or something?
edit: Let me explain my actual title question, since it seems silly:
if I = V/R and I is current, V is voltage, and R is resistance,
then I = V/0 inside a battery, so a 9 volt/0 = not applicable charge, yet the batteries have a listed charge.
So if I have 200mA = 9000mV/0, I feel like I broke the laws of math.
I understand current is amps, and voltage/resistance = current. I understand voltage to be similar to having a bunch of heavy weights pushing down on a balloon full of water, and the amount of water that comes out is the current. The size of the hole is the conductance, and that's the opposite of resistance or ohms, just like wavelength and frequency are inverse, the smaller the hole, the bigger the resistance.
A couple of things bother me though.
How can a battery have a measurement of current, or even voltage if the battery isn't hooked up to anything?
How do high tension power lines change voltage and go back to lower voltage to increase range? I thought you couldn't change voltage.
how does something "regulate" voltage?
If you know what the amps are, why does voltage even matter?
An finally, why didn't my little LED brightness change when I changed my potentiometer setting, but changing the battery size worked just fine? Did I line them up wrong or something?
edit: Let me explain my actual title question, since it seems silly:
if I = V/R and I is current, V is voltage, and R is resistance,
then I = V/0 inside a battery, so a 9 volt/0 = not applicable charge, yet the batteries have a listed charge.
So if I have 200mA = 9000mV/0, I feel like I broke the laws of math.
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