For the past while I've been struggling to wrap my head around electricity.
One thing that has puzzled me to no end is the relationship between current and voltage.
On paper it's a really simple linear relationship. More voltage over a fixed resistance? That's more current. More resistance with a fixed voltage? Less current.
However, it seems to me that this rule is often broken. For example, Van de Graaff generators can create millions of volts across the human body, yet somehow with this massive voltage there is a limit to current. There is a quite popular video where a professor explains this is because current is low. However, if the human body is say 200k ohms shouldn't that be multiple amps?
It wasn't until a few days ago while daydreaming that I think I figured it out.
If current is limited by a series resistance then that means as the resistance of the load drops, the series resistance of the supply makes up a larger portion of the total resistance, and thus the voltage across the load drops, thus decreasing the overall current.
Does this mean then that a high voltage source with low current is actually low voltage across the load?
This seems to be the only way I can think of that current could be limited while obeying ohms law. Basically current limiting = voltage across the load limiting.
I am fully aware this post is probably full of painful misconceptions and so I would love any help anyone can provide. I feel electronics is often talked about in various forms of abstraction that make it extremely hard and frustrating for me to understand the fundamentals of what is happening. I struggle to live in a land of abstractions.