I can get the same amount of water out of something with a big pipe but low pressure or a smaller pipe but higher pressure.

So which one is voltage and which one is amperage? Is the pipe amperage or is the pressure amperage?

And how far can I carry this metaphor? How does it relate to real-world electronics? Can I compare filling that bucket to lighting an LED? For example, too much voltage will burn out an LED, so how does that relate to the water metaphor?